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-- Database schema | department : Department_ID [ INT ] primary_key , Name [ TEXT ] , Creation [ TEXT ] , Ranking [ INT ] , Budget_in_Billions [ INT ] , Num_Employees [ INT ] | head : head_ID [ INT ] primary_key , name [ TEXT ] , born_state [ TEXT ] , age [ INT ] | management : department_ID [ INT ] primary_key management.department_ID = department.Department_ID , head_ID [ INT ] management.head_ID = head.head_ID , temporary_acting [ TEXT ] | -- -- How many heads of the departments are older than 56 ?

SELECT count(*) FROM head WHERE age > 56;

-- Database schema | department : Department_ID [ INT ] primary_key , Name [ TEXT ] , Creation [ TEXT ] , Ranking [ INT ] , Budget_in_Billions [ INT ] , Num_Employees [ INT ] | head : head_ID [ INT ] primary_key , name [ TEXT ] , born_state [ TEXT ] , age [ INT ] | management : department_ID [ INT ] primary_key management.department_ID = department.Department_ID , head_ID [ INT ] management.head_ID = head.head_ID , temporary_acting [ TEXT ] | -- -- List the name, born state and age of the heads of departments ordered by age.

SELECT name , born_state , age FROM head ORDER BY age;

-- Database schema | department : Department_ID [ INT ] primary_key , Name [ TEXT ] , Creation [ TEXT ] , Ranking [ INT ] , Budget_in_Billions [ INT ] , Num_Employees [ INT ] | head : head_ID [ INT ] primary_key , name [ TEXT ] , born_state [ TEXT ] , age [ INT ] | management : department_ID [ INT ] primary_key management.department_ID = department.Department_ID , head_ID [ INT ] management.head_ID = head.head_ID , temporary_acting [ TEXT ] | -- -- List the creation year, name and budget of each department.

SELECT creation , name , budget_in_billions FROM department;

-- Database schema | department : Department_ID [ INT ] primary_key , Name [ TEXT ] , Creation [ TEXT ] , Ranking [ INT ] , Budget_in_Billions [ INT ] , Num_Employees [ INT ] | head : head_ID [ INT ] primary_key , name [ TEXT ] , born_state [ TEXT ] , age [ INT ] | management : department_ID [ INT ] primary_key management.department_ID = department.Department_ID , head_ID [ INT ] management.head_ID = head.head_ID , temporary_acting [ TEXT ] | -- -- What are the maximum and minimum budget of the departments?

SELECT max(budget_in_billions) , min(budget_in_billions) FROM department;

-- Database schema | department : Department_ID [ INT ] primary_key , Name [ TEXT ] , Creation [ TEXT ] , Ranking [ INT ] , Budget_in_Billions [ INT ] , Num_Employees [ INT ] | head : head_ID [ INT ] primary_key , name [ TEXT ] , born_state [ TEXT ] , age [ INT ] | management : department_ID [ INT ] primary_key management.department_ID = department.Department_ID , head_ID [ INT ] management.head_ID = head.head_ID , temporary_acting [ TEXT ] | -- -- What is the average number of employees of the departments whose rank is between 10 and 15?

SELECT avg(num_employees) FROM department WHERE ranking BETWEEN 10 AND 15;

-- Database schema | department : Department_ID [ INT ] primary_key , Name [ TEXT ] , Creation [ TEXT ] , Ranking [ INT ] , Budget_in_Billions [ INT ] , Num_Employees [ INT ] | head : head_ID [ INT ] primary_key , name [ TEXT ] , born_state [ TEXT ] , age [ INT ] | management : department_ID [ INT ] primary_key management.department_ID = department.Department_ID , head_ID [ INT ] management.head_ID = head.head_ID , temporary_acting [ TEXT ] | -- -- What are the names of the heads who are born outside the California state?

SELECT name FROM head WHERE born_state != 'California';

-- Database schema | department : Department_ID [ INT ] primary_key , Name [ TEXT ] , Creation [ TEXT ] , Ranking [ INT ] , Budget_in_Billions [ INT ] , Num_Employees [ INT ] | head : head_ID [ INT ] primary_key , name [ TEXT ] , born_state [ TEXT ] , age [ INT ] | management : department_ID [ INT ] primary_key management.department_ID = department.Department_ID , head_ID [ INT ] management.head_ID = head.head_ID , temporary_acting [ TEXT ] | -- -- What are the distinct creation years of the departments managed by a secretary born in state 'Alabama'?

SELECT DISTINCT T1.creation FROM department AS T1 JOIN management AS T2 ON T1.department_id = T2.department_id JOIN head AS T3 ON T2.head_id = T3.head_id WHERE T3.born_state = 'Alabama';

-- Database schema | department : Department_ID [ INT ] primary_key , Name [ TEXT ] , Creation [ TEXT ] , Ranking [ INT ] , Budget_in_Billions [ INT ] , Num_Employees [ INT ] | head : head_ID [ INT ] primary_key , name [ TEXT ] , born_state [ TEXT ] , age [ INT ] | management : department_ID [ INT ] primary_key management.department_ID = department.Department_ID , head_ID [ INT ] management.head_ID = head.head_ID , temporary_acting [ TEXT ] | -- -- What are the names of the states where at least 3 heads were born?

SELECT born_state FROM head GROUP BY born_state HAVING count(*) >= 3;

-- Database schema | department : Department_ID [ INT ] primary_key , Name [ TEXT ] , Creation [ TEXT ] , Ranking [ INT ] , Budget_in_Billions [ INT ] , Num_Employees [ INT ] | head : head_ID [ INT ] primary_key , name [ TEXT ] , born_state [ TEXT ] , age [ INT ] | management : department_ID [ INT ] primary_key management.department_ID = department.Department_ID , head_ID [ INT ] management.head_ID = head.head_ID , temporary_acting [ TEXT ] | -- -- In which year were most departments established?

SELECT creation FROM department GROUP BY creation ORDER BY count(*) DESC LIMIT 1;

-- Database schema | department : Department_ID [ INT ] primary_key , Name [ TEXT ] , Creation [ TEXT ] , Ranking [ INT ] , Budget_in_Billions [ INT ] , Num_Employees [ INT ] | head : head_ID [ INT ] primary_key , name [ TEXT ] , born_state [ TEXT ] , age [ INT ] | management : department_ID [ INT ] primary_key management.department_ID = department.Department_ID , head_ID [ INT ] management.head_ID = head.head_ID , temporary_acting [ TEXT ] | -- -- Show the name and number of employees for the departments managed by heads whose temporary acting value is 'Yes'?

SELECT T1.name , T1.num_employees FROM department AS T1 JOIN management AS T2 ON T1.department_id = T2.department_id WHERE T2.temporary_acting = 'Yes';

-- Database schema | department : Department_ID [ INT ] primary_key , Name [ TEXT ] , Creation [ TEXT ] , Ranking [ INT ] , Budget_in_Billions [ INT ] , Num_Employees [ INT ] | head : head_ID [ INT ] primary_key , name [ TEXT ] , born_state [ TEXT ] , age [ INT ] | management : department_ID [ INT ] primary_key management.department_ID = department.Department_ID , head_ID [ INT ] management.head_ID = head.head_ID , temporary_acting [ TEXT ] | -- -- How many acting statuses are there?

SELECT count(DISTINCT temporary_acting) FROM management;

-- Database schema | department : Department_ID [ INT ] primary_key , Name [ TEXT ] , Creation [ TEXT ] , Ranking [ INT ] , Budget_in_Billions [ INT ] , Num_Employees [ INT ] | head : head_ID [ INT ] primary_key , name [ TEXT ] , born_state [ TEXT ] , age [ INT ] | management : department_ID [ INT ] primary_key management.department_ID = department.Department_ID , head_ID [ INT ] management.head_ID = head.head_ID , temporary_acting [ TEXT ] | -- -- How many departments are led by heads who are not mentioned?

SELECT count(*) FROM department WHERE department_id NOT IN (SELECT department_id FROM management);

-- Database schema | department : Department_ID [ INT ] primary_key , Name [ TEXT ] , Creation [ TEXT ] , Ranking [ INT ] , Budget_in_Billions [ INT ] , Num_Employees [ INT ] | head : head_ID [ INT ] primary_key , name [ TEXT ] , born_state [ TEXT ] , age [ INT ] | management : department_ID [ INT ] primary_key management.department_ID = department.Department_ID , head_ID [ INT ] management.head_ID = head.head_ID , temporary_acting [ TEXT ] | -- -- What are the distinct ages of the heads who are acting?

SELECT DISTINCT T1.age FROM management AS T2 JOIN head AS T1 ON T1.head_id = T2.head_id WHERE T2.temporary_acting = 'Yes';

-- Database schema | department : Department_ID [ INT ] primary_key , Name [ TEXT ] , Creation [ TEXT ] , Ranking [ INT ] , Budget_in_Billions [ INT ] , Num_Employees [ INT ] | head : head_ID [ INT ] primary_key , name [ TEXT ] , born_state [ TEXT ] , age [ INT ] | management : department_ID [ INT ] primary_key management.department_ID = department.Department_ID , head_ID [ INT ] management.head_ID = head.head_ID , temporary_acting [ TEXT ] | -- -- List the states where both the secretary of 'Treasury' department and the secretary of 'Homeland Security' were born.

SELECT T3.born_state FROM department AS T1 JOIN management AS T2 ON T1.department_id = T2.department_id JOIN head AS T3 ON T2.head_id = T3.head_id WHERE T1.name = 'Treasury' INTERSECT SELECT T3.born_state FROM department AS T1 JOIN management AS T2 ON T1.department_id = T2.department_id JOIN head AS T3 ON T2.head_id = T3.head_id WHERE T1.name = 'Homeland Security';

-- Database schema | department : Department_ID [ INT ] primary_key , Name [ TEXT ] , Creation [ TEXT ] , Ranking [ INT ] , Budget_in_Billions [ INT ] , Num_Employees [ INT ] | head : head_ID [ INT ] primary_key , name [ TEXT ] , born_state [ TEXT ] , age [ INT ] | management : department_ID [ INT ] primary_key management.department_ID = department.Department_ID , head_ID [ INT ] management.head_ID = head.head_ID , temporary_acting [ TEXT ] | -- -- Which department has more than 1 head at a time? List the id, name and the number of heads.

SELECT T1.department_id , T1.name , count(*) FROM management AS T2 JOIN department AS T1 ON T1.department_id = T2.department_id GROUP BY T1.department_id HAVING count(*) > 1;

-- Database schema | department : Department_ID [ INT ] primary_key , Name [ TEXT ] , Creation [ TEXT ] , Ranking [ INT ] , Budget_in_Billions [ INT ] , Num_Employees [ INT ] | head : head_ID [ INT ] primary_key , name [ TEXT ] , born_state [ TEXT ] , age [ INT ] | management : department_ID [ INT ] primary_key management.department_ID = department.Department_ID , head_ID [ INT ] management.head_ID = head.head_ID , temporary_acting [ TEXT ] | -- -- Which head's name has the substring 'Ha'? List the id and name.

SELECT head_id , name FROM head WHERE name LIKE '%Ha%';

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- How many farms are there?

SELECT count(*) FROM farm;

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- Count the number of farms.

SELECT count(*) FROM farm;

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- List the total number of horses on farms in ascending order.

SELECT Total_Horses FROM farm ORDER BY Total_Horses ASC;

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- What is the total horses record for each farm, sorted ascending?

SELECT Total_Horses FROM farm ORDER BY Total_Horses ASC;

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- What are the hosts of competitions whose theme is not "Aliens"?

SELECT Hosts FROM farm_competition WHERE Theme != 'Aliens';

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- Return the hosts of competitions for which the theme is not Aliens?

SELECT Hosts FROM farm_competition WHERE Theme != 'Aliens';

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- What are the themes of farm competitions sorted by year in ascending order?

SELECT Theme FROM farm_competition ORDER BY YEAR ASC;

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- Return the themes of farm competitions, sorted by year ascending.

SELECT Theme FROM farm_competition ORDER BY YEAR ASC;

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- What is the average number of working horses of farms with more than 5000 total number of horses?

SELECT avg(Working_Horses) FROM farm WHERE Total_Horses > 5000;

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- Give the average number of working horses on farms with more than 5000 total horses.

SELECT avg(Working_Horses) FROM farm WHERE Total_Horses > 5000;

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- What are the maximum and minimum number of cows across all farms.

SELECT max(Cows) , min(Cows) FROM farm;

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- Return the maximum and minimum number of cows across all farms.

SELECT max(Cows) , min(Cows) FROM farm;

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- How many different statuses do cities have?

SELECT count(DISTINCT Status) FROM city;

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- Count the number of different statuses.

SELECT count(DISTINCT Status) FROM city;

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- List official names of cities in descending order of population.

SELECT Official_Name FROM city ORDER BY Population DESC;

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- What are the official names of cities, ordered descending by population?

SELECT Official_Name FROM city ORDER BY Population DESC;

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- List the official name and status of the city with the largest population.

SELECT Official_Name , Status FROM city ORDER BY Population DESC LIMIT 1;

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- What is the official name and status of the city with the most residents?

SELECT Official_Name , Status FROM city ORDER BY Population DESC LIMIT 1;

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- Show the years and the official names of the host cities of competitions.

SELECT T2.Year , T1.Official_Name FROM city AS T1 JOIN farm_competition AS T2 ON T1.City_ID = T2.Host_city_ID;

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- Give the years and official names of the cities of each competition.

SELECT T2.Year , T1.Official_Name FROM city AS T1 JOIN farm_competition AS T2 ON T1.City_ID = T2.Host_city_ID;

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- Show the official names of the cities that have hosted more than one competition.

SELECT T1.Official_Name FROM city AS T1 JOIN farm_competition AS T2 ON T1.City_ID = T2.Host_city_ID GROUP BY T2.Host_city_ID HAVING COUNT(*) > 1;

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- What are the official names of cities that have hosted more than one competition?

SELECT T1.Official_Name FROM city AS T1 JOIN farm_competition AS T2 ON T1.City_ID = T2.Host_city_ID GROUP BY T2.Host_city_ID HAVING COUNT(*) > 1;

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- Show the status of the city that has hosted the greatest number of competitions.

SELECT T1.Status FROM city AS T1 JOIN farm_competition AS T2 ON T1.City_ID = T2.Host_city_ID GROUP BY T2.Host_city_ID ORDER BY COUNT(*) DESC LIMIT 1;

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- What is the status of the city that has hosted the most competitions?

SELECT T1.Status FROM city AS T1 JOIN farm_competition AS T2 ON T1.City_ID = T2.Host_city_ID GROUP BY T2.Host_city_ID ORDER BY COUNT(*) DESC LIMIT 1;

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- Please show the themes of competitions with host cities having populations larger than 1000.

SELECT T2.Theme FROM city AS T1 JOIN farm_competition AS T2 ON T1.City_ID = T2.Host_city_ID WHERE T1.Population > 1000;

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- What are the themes of competitions that have corresponding host cities with more than 1000 residents?

SELECT T2.Theme FROM city AS T1 JOIN farm_competition AS T2 ON T1.City_ID = T2.Host_city_ID WHERE T1.Population > 1000;

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- Please show the different statuses of cities and the average population of cities with each status.

SELECT Status , avg(Population) FROM city GROUP BY Status;

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- What are the statuses and average populations of each city?

SELECT Status , avg(Population) FROM city GROUP BY Status;

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- Please show the different statuses, ordered by the number of cities that have each.

SELECT Status FROM city GROUP BY Status ORDER BY COUNT(*) ASC;

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- Return the different statuses of cities, ascending by frequency.

SELECT Status FROM city GROUP BY Status ORDER BY COUNT(*) ASC;

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- List the most common type of Status across cities.

SELECT Status FROM city GROUP BY Status ORDER BY COUNT(*) DESC LIMIT 1;

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- What is the most common status across all cities?

SELECT Status FROM city GROUP BY Status ORDER BY COUNT(*) DESC LIMIT 1;

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- List the official names of cities that have not held any competition.

SELECT Official_Name FROM city WHERE City_ID NOT IN (SELECT Host_city_ID FROM farm_competition);

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- What are the official names of cities that have not hosted a farm competition?

SELECT Official_Name FROM city WHERE City_ID NOT IN (SELECT Host_city_ID FROM farm_competition);

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- Show the status shared by cities with population bigger than 1500 and smaller than 500.

SELECT Status FROM city WHERE Population > 1500 INTERSECT SELECT Status FROM city WHERE Population < 500;

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- Which statuses correspond to both cities that have a population over 1500 and cities that have a population lower than 500?

SELECT Status FROM city WHERE Population > 1500 INTERSECT SELECT Status FROM city WHERE Population < 500;

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- Find the official names of cities with population bigger than 1500 or smaller than 500.

SELECT Official_Name FROM city WHERE Population > 1500 OR Population < 500;

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- What are the official names of cities that have population over 1500 or less than 500?

SELECT Official_Name FROM city WHERE Population > 1500 OR Population < 500;

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- Show the census ranking of cities whose status are not "Village".

SELECT Census_Ranking FROM city WHERE Status != "Village";

-- Database schema | city : City_ID [ INT ] primary_key , Official_Name [ TEXT ] , Status [ TEXT ] , Area_km_2 [ INT ] , Population [ INT ] , Census_Ranking [ TEXT ] | farm : Farm_ID [ INT ] primary_key , Year [ INT ] , Total_Horses [ INT ] , Working_Horses [ INT ] , Total_Cattle [ INT ] , Oxen [ INT ] , Bulls [ INT ] , Cows [ INT ] , Pigs [ INT ] , Sheep_and_Goats [ INT ] | farm_competition : Competition_ID [ INT ] primary_key , Year [ INT ] , Theme [ TEXT ] , Host_city_ID [ INT ] farm_competition.Host_city_ID = city.City_ID , Hosts [ TEXT ] | competition_record : Competition_ID [ INT ] primary_key competition_record.Competition_ID = farm_competition.Competition_ID , Farm_ID [ INT ] competition_record.Farm_ID = farm.Farm_ID , Rank [ INT ] | -- -- What are the census rankings of cities that do not have the status "Village"?

SELECT Census_Ranking FROM city WHERE Status != "Village";

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- which course has most number of registered students?

SELECT T1.course_name FROM courses AS T1 JOIN student_course_registrations AS T2 ON T1.course_id = T2.course_Id GROUP BY T1.course_id ORDER BY count(*) DESC LIMIT 1;

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- What is the name of the course with the most registered students?

SELECT T1.course_name FROM courses AS T1 JOIN student_course_registrations AS T2 ON T1.course_id = T2.course_Id GROUP BY T1.course_id ORDER BY count(*) DESC LIMIT 1;

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- what is id of students who registered some courses but the least number of courses in these students?

SELECT student_id FROM student_course_registrations GROUP BY student_id ORDER BY count(*) LIMIT 1;

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- What are the ids of the students who registered for some courses but had the least number of courses for all students?

SELECT student_id FROM student_course_registrations GROUP BY student_id ORDER BY count(*) LIMIT 1;

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- what are the first name and last name of all candidates?

SELECT T2.first_name , T2.last_name FROM candidates AS T1 JOIN people AS T2 ON T1.candidate_id = T2.person_id;

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- What are the first and last names of all the candidates?

SELECT T2.first_name , T2.last_name FROM candidates AS T1 JOIN people AS T2 ON T1.candidate_id = T2.person_id;

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- List the id of students who never attends courses?

SELECT student_id FROM students WHERE student_id NOT IN (SELECT student_id FROM student_course_attendance);

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- What are the ids of every student who has never attended a course?

SELECT student_id FROM students WHERE student_id NOT IN (SELECT student_id FROM student_course_attendance);

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- List the id of students who attended some courses?

SELECT student_id FROM student_course_attendance;

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- What are the ids of all students who have attended at least one course?

SELECT student_id FROM student_course_attendance;

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- What are the ids of all students for courses and what are the names of those courses?

SELECT T1.student_id , T2.course_name FROM student_course_registrations AS T1 JOIN courses AS T2 ON T1.course_id = T2.course_id;

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- What is detail of the student who most recently registered course?

SELECT T2.student_details FROM student_course_registrations AS T1 JOIN students AS T2 ON T1.student_id = T2.student_id ORDER BY T1.registration_date DESC LIMIT 1;

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- What details do we have on the students who registered for courses most recently?

SELECT T2.student_details FROM student_course_registrations AS T1 JOIN students AS T2 ON T1.student_id = T2.student_id ORDER BY T1.registration_date DESC LIMIT 1;

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- How many students attend course English?

SELECT count(*) FROM courses AS T1 JOIN student_course_attendance AS T2 ON T1.course_id = T2.course_id WHERE T1.course_name = "English";

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- How many students are attending English courses?

SELECT count(*) FROM courses AS T1 JOIN student_course_attendance AS T2 ON T1.course_id = T2.course_id WHERE T1.course_name = "English";

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- How many courses do the student whose id is 171 attend?

SELECT count(*) FROM courses AS T1 JOIN student_course_attendance AS T2 ON T1.course_id = T2.course_id WHERE T2.student_id = 171;

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- How many courses does the student with id 171 actually attend?

SELECT count(*) FROM courses AS T1 JOIN student_course_attendance AS T2 ON T1.course_id = T2.course_id WHERE T2.student_id = 171;

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- Find id of the candidate whose email is stanley.monahan@example.org?

SELECT T2.candidate_id FROM people AS T1 JOIN candidates AS T2 ON T1.person_id = T2.candidate_id WHERE T1.email_address = "stanley.monahan@example.org";

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- What is the id of the candidate whose email is stanley.monahan@example.org?

SELECT T2.candidate_id FROM people AS T1 JOIN candidates AS T2 ON T1.person_id = T2.candidate_id WHERE T1.email_address = "stanley.monahan@example.org";

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- Find id of the candidate who most recently accessed the course?

SELECT candidate_id FROM candidate_assessments ORDER BY assessment_date DESC LIMIT 1;

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- What is the id of the candidate who most recently accessed the course?

SELECT candidate_id FROM candidate_assessments ORDER BY assessment_date DESC LIMIT 1;

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- What is detail of the student who registered the most number of courses?

SELECT T1.student_details FROM students AS T1 JOIN student_course_registrations AS T2 ON T1.student_id = T2.student_id GROUP BY T1.student_id ORDER BY count(*) DESC LIMIT 1;

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- What are the details of the student who registered for the most number of courses?

SELECT T1.student_details FROM students AS T1 JOIN student_course_registrations AS T2 ON T1.student_id = T2.student_id GROUP BY T1.student_id ORDER BY count(*) DESC LIMIT 1;

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- List the id of students who registered some courses and the number of their registered courses?

SELECT T1.student_id , count(*) FROM students AS T1 JOIN student_course_registrations AS T2 ON T1.student_id = T2.student_id GROUP BY T1.student_id;

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- For every student who is registered for some course, how many courses are they registered for?

SELECT T1.student_id , count(*) FROM students AS T1 JOIN student_course_registrations AS T2 ON T1.student_id = T2.student_id GROUP BY T1.student_id;

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- How many registed students do each course have? List course name and the number of their registered students?

SELECT T3.course_name , count(*) FROM students AS T1 JOIN student_course_registrations AS T2 ON T1.student_id = T2.student_id JOIN courses AS T3 ON T2.course_id = T3.course_id GROUP BY T2.course_id;

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- For each course id, how many students are registered and what are the course names?

SELECT T3.course_name , count(*) FROM students AS T1 JOIN student_course_registrations AS T2 ON T1.student_id = T2.student_id JOIN courses AS T3 ON T2.course_id = T3.course_id GROUP BY T2.course_id;

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- Find id of candidates whose assessment code is "Pass"?

SELECT candidate_id FROM candidate_assessments WHERE asessment_outcome_code = "Pass";

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- What are the ids of the candidates that have an outcome code of Pass?

SELECT candidate_id FROM candidate_assessments WHERE asessment_outcome_code = "Pass";

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- Find the cell mobile number of the candidates whose assessment code is "Fail"?

SELECT T3.cell_mobile_number FROM candidates AS T1 JOIN candidate_assessments AS T2 ON T1.candidate_id = T2.candidate_id JOIN people AS T3 ON T1.candidate_id = T3.person_id WHERE T2.asessment_outcome_code = "Fail";

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- What are the cell phone numbers of the candidates that received an assessment code of "Fail"?

SELECT T3.cell_mobile_number FROM candidates AS T1 JOIN candidate_assessments AS T2 ON T1.candidate_id = T2.candidate_id JOIN people AS T3 ON T1.candidate_id = T3.person_id WHERE T2.asessment_outcome_code = "Fail";

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- What are the id of students who registered course 301?

SELECT student_id FROM student_course_attendance WHERE course_id = 301;

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- What are the ids of the students who registered for course 301?

SELECT student_id FROM student_course_attendance WHERE course_id = 301;

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- What is the id of the student who most recently registered course 301?

SELECT student_id FROM student_course_attendance WHERE course_id = 301 ORDER BY date_of_attendance DESC LIMIT 1;

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- What are the ids of the students who registered for course 301 most recently?

SELECT student_id FROM student_course_attendance WHERE course_id = 301 ORDER BY date_of_attendance DESC LIMIT 1;

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- Find distinct cities of addresses of people?

SELECT DISTINCT T1.city FROM addresses AS T1 JOIN people_addresses AS T2 ON T1.address_id = T2.address_id;

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- What are the different cities where people live?

SELECT DISTINCT T1.city FROM addresses AS T1 JOIN people_addresses AS T2 ON T1.address_id = T2.address_id;

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- Find distinct cities of address of students?

SELECT DISTINCT T1.city FROM addresses AS T1 JOIN people_addresses AS T2 ON T1.address_id = T2.address_id JOIN students AS T3 ON T2.person_id = T3.student_id;

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- What are the different cities where students live?

SELECT DISTINCT T1.city FROM addresses AS T1 JOIN people_addresses AS T2 ON T1.address_id = T2.address_id JOIN students AS T3 ON T2.person_id = T3.student_id;

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- List the names of courses in alphabetical order?

SELECT course_name FROM courses ORDER BY course_name;

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- What are the names of the courses in alphabetical order?

SELECT course_name FROM courses ORDER BY course_name;

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- List the first names of people in alphabetical order?

SELECT first_name FROM people ORDER BY first_name;

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- What are the first names of the people in alphabetical order?

SELECT first_name FROM people ORDER BY first_name;

-- Database schema | Addresses : address_id [ INT ] primary_key , line_1 [ TEXT ] , line_2 [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | People : person_id [ INT ] primary_key , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , cell_mobile_number [ TEXT ] , email_address [ TEXT ] , login_name [ TEXT ] , password [ TEXT ] | Students : student_id [ INT ] primary_key Students.student_id = People.person_id , student_details [ TEXT ] | Courses : course_id [ TEXT ] primary_key , course_name [ TEXT ] , course_description [ TEXT ] , other_details [ TEXT ] | People_Addresses : person_address_id [ INT ] primary_key , person_id [ INT ] People_Addresses.person_id = People.person_id , address_id [ INT ] People_Addresses.address_id = Addresses.address_id , date_from [ TEXT ] , date_to [ TEXT ] | Student_Course_Registrations : student_id [ INT ] primary_key Student_Course_Registrations.student_id = Students.student_id , course_id [ INT ] Student_Course_Registrations.course_id = Courses.course_id , registration_date [ TEXT ] | Student_Course_Attendance : student_id [ INT ] primary_key Student_Course_Attendance.student_id = Student_Course_Registrations.student_id , course_id [ INT ] Student_Course_Attendance.course_id = Student_Course_Registrations.course_id , date_of_attendance [ TEXT ] | Candidates : candidate_id [ INT ] primary_key Candidates.candidate_id = People.person_id , candidate_details [ TEXT ] | Candidate_Assessments : candidate_id [ INT ] primary_key Candidate_Assessments.candidate_id = Candidates.candidate_id , qualification [ TEXT ] , assessment_date [ TEXT ] , asessment_outcome_code [ TEXT ] | -- -- What are the id of students who registered courses or attended courses?

SELECT student_id FROM student_course_registrations UNION SELECT student_id FROM student_course_attendance;