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-- Database schema | flight : flno [ INT ] primary_key , origin [ TEXT ] , destination [ TEXT ] , distance [ INT ] , departure_date [ TEXT ] , arrival_date [ TEXT ] , price [ INT ] , aid [ INT ] flight.aid = aircraft.aid | aircraft : aid [ INT ] primary_key , name [ TEXT ] , distance [ INT ] | employee : eid [ INT ] primary_key , name [ TEXT ] , salary [ INT ] | certificate : eid [ INT ] primary_key certificate.eid = employee.eid , aid [ INT ] certificate.aid = aircraft.aid | -- -- What are the numbers of the shortest flights?

SELECT flno FROM Flight ORDER BY distance ASC LIMIT 3;

-- Database schema | flight : flno [ INT ] primary_key , origin [ TEXT ] , destination [ TEXT ] , distance [ INT ] , departure_date [ TEXT ] , arrival_date [ TEXT ] , price [ INT ] , aid [ INT ] flight.aid = aircraft.aid | aircraft : aid [ INT ] primary_key , name [ TEXT ] , distance [ INT ] | employee : eid [ INT ] primary_key , name [ TEXT ] , salary [ INT ] | certificate : eid [ INT ] primary_key certificate.eid = employee.eid , aid [ INT ] certificate.aid = aircraft.aid | -- -- What is the average distance and average price for flights from Los Angeles.

SELECT avg(distance) , avg(price) FROM Flight WHERE origin = "Los Angeles";

-- Database schema | flight : flno [ INT ] primary_key , origin [ TEXT ] , destination [ TEXT ] , distance [ INT ] , departure_date [ TEXT ] , arrival_date [ TEXT ] , price [ INT ] , aid [ INT ] flight.aid = aircraft.aid | aircraft : aid [ INT ] primary_key , name [ TEXT ] , distance [ INT ] | employee : eid [ INT ] primary_key , name [ TEXT ] , salary [ INT ] | certificate : eid [ INT ] primary_key certificate.eid = employee.eid , aid [ INT ] certificate.aid = aircraft.aid | -- -- What is the average distance and price for all flights from LA?

SELECT avg(distance) , avg(price) FROM Flight WHERE origin = "Los Angeles";

-- Database schema | flight : flno [ INT ] primary_key , origin [ TEXT ] , destination [ TEXT ] , distance [ INT ] , departure_date [ TEXT ] , arrival_date [ TEXT ] , price [ INT ] , aid [ INT ] flight.aid = aircraft.aid | aircraft : aid [ INT ] primary_key , name [ TEXT ] , distance [ INT ] | employee : eid [ INT ] primary_key , name [ TEXT ] , salary [ INT ] | certificate : eid [ INT ] primary_key certificate.eid = employee.eid , aid [ INT ] certificate.aid = aircraft.aid | -- -- Show all origins and the number of flights from each origin.

SELECT origin , count(*) FROM Flight GROUP BY origin;

-- Database schema | flight : flno [ INT ] primary_key , origin [ TEXT ] , destination [ TEXT ] , distance [ INT ] , departure_date [ TEXT ] , arrival_date [ TEXT ] , price [ INT ] , aid [ INT ] flight.aid = aircraft.aid | aircraft : aid [ INT ] primary_key , name [ TEXT ] , distance [ INT ] | employee : eid [ INT ] primary_key , name [ TEXT ] , salary [ INT ] | certificate : eid [ INT ] primary_key certificate.eid = employee.eid , aid [ INT ] certificate.aid = aircraft.aid | -- -- For each origin, how many flights came from there?

SELECT origin , count(*) FROM Flight GROUP BY origin;

-- Database schema | flight : flno [ INT ] primary_key , origin [ TEXT ] , destination [ TEXT ] , distance [ INT ] , departure_date [ TEXT ] , arrival_date [ TEXT ] , price [ INT ] , aid [ INT ] flight.aid = aircraft.aid | aircraft : aid [ INT ] primary_key , name [ TEXT ] , distance [ INT ] | employee : eid [ INT ] primary_key , name [ TEXT ] , salary [ INT ] | certificate : eid [ INT ] primary_key certificate.eid = employee.eid , aid [ INT ] certificate.aid = aircraft.aid | -- -- Show all destinations and the number of flights to each destination.

SELECT destination , count(*) FROM Flight GROUP BY destination;

-- Database schema | flight : flno [ INT ] primary_key , origin [ TEXT ] , destination [ TEXT ] , distance [ INT ] , departure_date [ TEXT ] , arrival_date [ TEXT ] , price [ INT ] , aid [ INT ] flight.aid = aircraft.aid | aircraft : aid [ INT ] primary_key , name [ TEXT ] , distance [ INT ] | employee : eid [ INT ] primary_key , name [ TEXT ] , salary [ INT ] | certificate : eid [ INT ] primary_key certificate.eid = employee.eid , aid [ INT ] certificate.aid = aircraft.aid | -- -- What are the destinations and number of flights to each one?

SELECT destination , count(*) FROM Flight GROUP BY destination;

-- Database schema | flight : flno [ INT ] primary_key , origin [ TEXT ] , destination [ TEXT ] , distance [ INT ] , departure_date [ TEXT ] , arrival_date [ TEXT ] , price [ INT ] , aid [ INT ] flight.aid = aircraft.aid | aircraft : aid [ INT ] primary_key , name [ TEXT ] , distance [ INT ] | employee : eid [ INT ] primary_key , name [ TEXT ] , salary [ INT ] | certificate : eid [ INT ] primary_key certificate.eid = employee.eid , aid [ INT ] certificate.aid = aircraft.aid | -- -- Which origin has most number of flights?

SELECT origin FROM Flight GROUP BY origin ORDER BY count(*) DESC LIMIT 1;

-- Database schema | flight : flno [ INT ] primary_key , origin [ TEXT ] , destination [ TEXT ] , distance [ INT ] , departure_date [ TEXT ] , arrival_date [ TEXT ] , price [ INT ] , aid [ INT ] flight.aid = aircraft.aid | aircraft : aid [ INT ] primary_key , name [ TEXT ] , distance [ INT ] | employee : eid [ INT ] primary_key , name [ TEXT ] , salary [ INT ] | certificate : eid [ INT ] primary_key certificate.eid = employee.eid , aid [ INT ] certificate.aid = aircraft.aid | -- -- What place has the most flights coming from there?

SELECT origin FROM Flight GROUP BY origin ORDER BY count(*) DESC LIMIT 1;

-- Database schema | flight : flno [ INT ] primary_key , origin [ TEXT ] , destination [ TEXT ] , distance [ INT ] , departure_date [ TEXT ] , arrival_date [ TEXT ] , price [ INT ] , aid [ INT ] flight.aid = aircraft.aid | aircraft : aid [ INT ] primary_key , name [ TEXT ] , distance [ INT ] | employee : eid [ INT ] primary_key , name [ TEXT ] , salary [ INT ] | certificate : eid [ INT ] primary_key certificate.eid = employee.eid , aid [ INT ] certificate.aid = aircraft.aid | -- -- Which destination has least number of flights?

SELECT destination FROM Flight GROUP BY destination ORDER BY count(*) LIMIT 1;

-- Database schema | flight : flno [ INT ] primary_key , origin [ TEXT ] , destination [ TEXT ] , distance [ INT ] , departure_date [ TEXT ] , arrival_date [ TEXT ] , price [ INT ] , aid [ INT ] flight.aid = aircraft.aid | aircraft : aid [ INT ] primary_key , name [ TEXT ] , distance [ INT ] | employee : eid [ INT ] primary_key , name [ TEXT ] , salary [ INT ] | certificate : eid [ INT ] primary_key certificate.eid = employee.eid , aid [ INT ] certificate.aid = aircraft.aid | -- -- What destination has the fewest number of flights?

SELECT destination FROM Flight GROUP BY destination ORDER BY count(*) LIMIT 1;

-- Database schema | flight : flno [ INT ] primary_key , origin [ TEXT ] , destination [ TEXT ] , distance [ INT ] , departure_date [ TEXT ] , arrival_date [ TEXT ] , price [ INT ] , aid [ INT ] flight.aid = aircraft.aid | aircraft : aid [ INT ] primary_key , name [ TEXT ] , distance [ INT ] | employee : eid [ INT ] primary_key , name [ TEXT ] , salary [ INT ] | certificate : eid [ INT ] primary_key certificate.eid = employee.eid , aid [ INT ] certificate.aid = aircraft.aid | -- -- What is the aircraft name for the flight with number 99

SELECT T2.name FROM Flight AS T1 JOIN Aircraft AS T2 ON T1.aid = T2.aid WHERE T1.flno = 99;

-- Database schema | flight : flno [ INT ] primary_key , origin [ TEXT ] , destination [ TEXT ] , distance [ INT ] , departure_date [ TEXT ] , arrival_date [ TEXT ] , price [ INT ] , aid [ INT ] flight.aid = aircraft.aid | aircraft : aid [ INT ] primary_key , name [ TEXT ] , distance [ INT ] | employee : eid [ INT ] primary_key , name [ TEXT ] , salary [ INT ] | certificate : eid [ INT ] primary_key certificate.eid = employee.eid , aid [ INT ] certificate.aid = aircraft.aid | -- -- What is the name of the aircraft that was on flight number 99?

SELECT T2.name FROM Flight AS T1 JOIN Aircraft AS T2 ON T1.aid = T2.aid WHERE T1.flno = 99;

-- Database schema | flight : flno [ INT ] primary_key , origin [ TEXT ] , destination [ TEXT ] , distance [ INT ] , departure_date [ TEXT ] , arrival_date [ TEXT ] , price [ INT ] , aid [ INT ] flight.aid = aircraft.aid | aircraft : aid [ INT ] primary_key , name [ TEXT ] , distance [ INT ] | employee : eid [ INT ] primary_key , name [ TEXT ] , salary [ INT ] | certificate : eid [ INT ] primary_key certificate.eid = employee.eid , aid [ INT ] certificate.aid = aircraft.aid | -- -- Show all flight numbers with aircraft Airbus A340-300.

SELECT T1.flno FROM Flight AS T1 JOIN Aircraft AS T2 ON T1.aid = T2.aid WHERE T2.name = "Airbus A340-300";

-- Database schema | flight : flno [ INT ] primary_key , origin [ TEXT ] , destination [ TEXT ] , distance [ INT ] , departure_date [ TEXT ] , arrival_date [ TEXT ] , price [ INT ] , aid [ INT ] flight.aid = aircraft.aid | aircraft : aid [ INT ] primary_key , name [ TEXT ] , distance [ INT ] | employee : eid [ INT ] primary_key , name [ TEXT ] , salary [ INT ] | certificate : eid [ INT ] primary_key certificate.eid = employee.eid , aid [ INT ] certificate.aid = aircraft.aid | -- -- What are the flight numbers for the aircraft Airbus A340-300?

SELECT T1.flno FROM Flight AS T1 JOIN Aircraft AS T2 ON T1.aid = T2.aid WHERE T2.name = "Airbus A340-300";

-- Database schema | flight : flno [ INT ] primary_key , origin [ TEXT ] , destination [ TEXT ] , distance [ INT ] , departure_date [ TEXT ] , arrival_date [ TEXT ] , price [ INT ] , aid [ INT ] flight.aid = aircraft.aid | aircraft : aid [ INT ] primary_key , name [ TEXT ] , distance [ INT ] | employee : eid [ INT ] primary_key , name [ TEXT ] , salary [ INT ] | certificate : eid [ INT ] primary_key certificate.eid = employee.eid , aid [ INT ] certificate.aid = aircraft.aid | -- -- Show aircraft names and number of flights for each aircraft.

SELECT T2.name , count(*) FROM Flight AS T1 JOIN Aircraft AS T2 ON T1.aid = T2.aid GROUP BY T1.aid;

-- Database schema | flight : flno [ INT ] primary_key , origin [ TEXT ] , destination [ TEXT ] , distance [ INT ] , departure_date [ TEXT ] , arrival_date [ TEXT ] , price [ INT ] , aid [ INT ] flight.aid = aircraft.aid | aircraft : aid [ INT ] primary_key , name [ TEXT ] , distance [ INT ] | employee : eid [ INT ] primary_key , name [ TEXT ] , salary [ INT ] | certificate : eid [ INT ] primary_key certificate.eid = employee.eid , aid [ INT ] certificate.aid = aircraft.aid | -- -- What is the name of each aircraft and how many flights does each one complete?

SELECT T2.name , count(*) FROM Flight AS T1 JOIN Aircraft AS T2 ON T1.aid = T2.aid GROUP BY T1.aid;

-- Database schema | flight : flno [ INT ] primary_key , origin [ TEXT ] , destination [ TEXT ] , distance [ INT ] , departure_date [ TEXT ] , arrival_date [ TEXT ] , price [ INT ] , aid [ INT ] flight.aid = aircraft.aid | aircraft : aid [ INT ] primary_key , name [ TEXT ] , distance [ INT ] | employee : eid [ INT ] primary_key , name [ TEXT ] , salary [ INT ] | certificate : eid [ INT ] primary_key certificate.eid = employee.eid , aid [ INT ] certificate.aid = aircraft.aid | -- -- Show names for all aircraft with at least two flights.

SELECT T2.name FROM Flight AS T1 JOIN Aircraft AS T2 ON T1.aid = T2.aid GROUP BY T1.aid HAVING count(*) >= 2;

-- Database schema | flight : flno [ INT ] primary_key , origin [ TEXT ] , destination [ TEXT ] , distance [ INT ] , departure_date [ TEXT ] , arrival_date [ TEXT ] , price [ INT ] , aid [ INT ] flight.aid = aircraft.aid | aircraft : aid [ INT ] primary_key , name [ TEXT ] , distance [ INT ] | employee : eid [ INT ] primary_key , name [ TEXT ] , salary [ INT ] | certificate : eid [ INT ] primary_key certificate.eid = employee.eid , aid [ INT ] certificate.aid = aircraft.aid | -- -- What are the names for all aircrafts with at least 2 flights?

SELECT T2.name FROM Flight AS T1 JOIN Aircraft AS T2 ON T1.aid = T2.aid GROUP BY T1.aid HAVING count(*) >= 2;

-- Database schema | flight : flno [ INT ] primary_key , origin [ TEXT ] , destination [ TEXT ] , distance [ INT ] , departure_date [ TEXT ] , arrival_date [ TEXT ] , price [ INT ] , aid [ INT ] flight.aid = aircraft.aid | aircraft : aid [ INT ] primary_key , name [ TEXT ] , distance [ INT ] | employee : eid [ INT ] primary_key , name [ TEXT ] , salary [ INT ] | certificate : eid [ INT ] primary_key certificate.eid = employee.eid , aid [ INT ] certificate.aid = aircraft.aid | -- -- How many employees have certificate.

SELECT count(DISTINCT eid) FROM Certificate;

-- Database schema | flight : flno [ INT ] primary_key , origin [ TEXT ] , destination [ TEXT ] , distance [ INT ] , departure_date [ TEXT ] , arrival_date [ TEXT ] , price [ INT ] , aid [ INT ] flight.aid = aircraft.aid | aircraft : aid [ INT ] primary_key , name [ TEXT ] , distance [ INT ] | employee : eid [ INT ] primary_key , name [ TEXT ] , salary [ INT ] | certificate : eid [ INT ] primary_key certificate.eid = employee.eid , aid [ INT ] certificate.aid = aircraft.aid | -- -- What is the count of distinct employees with certificates?

SELECT count(DISTINCT eid) FROM Certificate;

-- Database schema | flight : flno [ INT ] primary_key , origin [ TEXT ] , destination [ TEXT ] , distance [ INT ] , departure_date [ TEXT ] , arrival_date [ TEXT ] , price [ INT ] , aid [ INT ] flight.aid = aircraft.aid | aircraft : aid [ INT ] primary_key , name [ TEXT ] , distance [ INT ] | employee : eid [ INT ] primary_key , name [ TEXT ] , salary [ INT ] | certificate : eid [ INT ] primary_key certificate.eid = employee.eid , aid [ INT ] certificate.aid = aircraft.aid | -- -- Show ids for all employees who don't have a certificate.

SELECT eid FROM Employee EXCEPT SELECT eid FROM Certificate;

-- Database schema | flight : flno [ INT ] primary_key , origin [ TEXT ] , destination [ TEXT ] , distance [ INT ] , departure_date [ TEXT ] , arrival_date [ TEXT ] , price [ INT ] , aid [ INT ] flight.aid = aircraft.aid | aircraft : aid [ INT ] primary_key , name [ TEXT ] , distance [ INT ] | employee : eid [ INT ] primary_key , name [ TEXT ] , salary [ INT ] | certificate : eid [ INT ] primary_key certificate.eid = employee.eid , aid [ INT ] certificate.aid = aircraft.aid | -- -- What are the ids of all employees that don't have certificates?

SELECT eid FROM Employee EXCEPT SELECT eid FROM Certificate;

-- Database schema | flight : flno [ INT ] primary_key , origin [ TEXT ] , destination [ TEXT ] , distance [ INT ] , departure_date [ TEXT ] , arrival_date [ TEXT ] , price [ INT ] , aid [ INT ] flight.aid = aircraft.aid | aircraft : aid [ INT ] primary_key , name [ TEXT ] , distance [ INT ] | employee : eid [ INT ] primary_key , name [ TEXT ] , salary [ INT ] | certificate : eid [ INT ] primary_key certificate.eid = employee.eid , aid [ INT ] certificate.aid = aircraft.aid | -- -- Show names for all aircrafts of which John Williams has certificates.

SELECT T3.name FROM Employee AS T1 JOIN Certificate AS T2 ON T1.eid = T2.eid JOIN Aircraft AS T3 ON T3.aid = T2.aid WHERE T1.name = "John Williams";

-- Database schema | flight : flno [ INT ] primary_key , origin [ TEXT ] , destination [ TEXT ] , distance [ INT ] , departure_date [ TEXT ] , arrival_date [ TEXT ] , price [ INT ] , aid [ INT ] flight.aid = aircraft.aid | aircraft : aid [ INT ] primary_key , name [ TEXT ] , distance [ INT ] | employee : eid [ INT ] primary_key , name [ TEXT ] , salary [ INT ] | certificate : eid [ INT ] primary_key certificate.eid = employee.eid , aid [ INT ] certificate.aid = aircraft.aid | -- -- What are the names of all aircrafts that John Williams have certificates to be able to fly?

SELECT T3.name FROM Employee AS T1 JOIN Certificate AS T2 ON T1.eid = T2.eid JOIN Aircraft AS T3 ON T3.aid = T2.aid WHERE T1.name = "John Williams";

-- Database schema | flight : flno [ INT ] primary_key , origin [ TEXT ] , destination [ TEXT ] , distance [ INT ] , departure_date [ TEXT ] , arrival_date [ TEXT ] , price [ INT ] , aid [ INT ] flight.aid = aircraft.aid | aircraft : aid [ INT ] primary_key , name [ TEXT ] , distance [ INT ] | employee : eid [ INT ] primary_key , name [ TEXT ] , salary [ INT ] | certificate : eid [ INT ] primary_key certificate.eid = employee.eid , aid [ INT ] certificate.aid = aircraft.aid | -- -- Show names for all employees who have certificate of Boeing 737-800.

SELECT T1.name FROM Employee AS T1 JOIN Certificate AS T2 ON T1.eid = T2.eid JOIN Aircraft AS T3 ON T3.aid = T2.aid WHERE T3.name = "Boeing 737-800";

-- Database schema | flight : flno [ INT ] primary_key , origin [ TEXT ] , destination [ TEXT ] , distance [ INT ] , departure_date [ TEXT ] , arrival_date [ TEXT ] , price [ INT ] , aid [ INT ] flight.aid = aircraft.aid | aircraft : aid [ INT ] primary_key , name [ TEXT ] , distance [ INT ] | employee : eid [ INT ] primary_key , name [ TEXT ] , salary [ INT ] | certificate : eid [ INT ] primary_key certificate.eid = employee.eid , aid [ INT ] certificate.aid = aircraft.aid | -- -- What are the names of all employees who have a certificate to fly Boeing 737-800?

SELECT T1.name FROM Employee AS T1 JOIN Certificate AS T2 ON T1.eid = T2.eid JOIN Aircraft AS T3 ON T3.aid = T2.aid WHERE T3.name = "Boeing 737-800";

-- Database schema | flight : flno [ INT ] primary_key , origin [ TEXT ] , destination [ TEXT ] , distance [ INT ] , departure_date [ TEXT ] , arrival_date [ TEXT ] , price [ INT ] , aid [ INT ] flight.aid = aircraft.aid | aircraft : aid [ INT ] primary_key , name [ TEXT ] , distance [ INT ] | employee : eid [ INT ] primary_key , name [ TEXT ] , salary [ INT ] | certificate : eid [ INT ] primary_key certificate.eid = employee.eid , aid [ INT ] certificate.aid = aircraft.aid | -- -- Show names for all employees who have certificates on both Boeing 737-800 and Airbus A340-300.

SELECT T1.name FROM Employee AS T1 JOIN Certificate AS T2 ON T1.eid = T2.eid JOIN Aircraft AS T3 ON T3.aid = T2.aid WHERE T3.name = "Boeing 737-800" INTERSECT SELECT T1.name FROM Employee AS T1 JOIN Certificate AS T2 ON T1.eid = T2.eid JOIN Aircraft AS T3 ON T3.aid = T2.aid WHERE T3.name = "Airbus A340-300";

-- Database schema | flight : flno [ INT ] primary_key , origin [ TEXT ] , destination [ TEXT ] , distance [ INT ] , departure_date [ TEXT ] , arrival_date [ TEXT ] , price [ INT ] , aid [ INT ] flight.aid = aircraft.aid | aircraft : aid [ INT ] primary_key , name [ TEXT ] , distance [ INT ] | employee : eid [ INT ] primary_key , name [ TEXT ] , salary [ INT ] | certificate : eid [ INT ] primary_key certificate.eid = employee.eid , aid [ INT ] certificate.aid = aircraft.aid | -- -- What are the names of all employees who can fly both the Boeing 737-800 and the Airbus A340-300?

SELECT T1.name FROM Employee AS T1 JOIN Certificate AS T2 ON T1.eid = T2.eid JOIN Aircraft AS T3 ON T3.aid = T2.aid WHERE T3.name = "Boeing 737-800" INTERSECT SELECT T1.name FROM Employee AS T1 JOIN Certificate AS T2 ON T1.eid = T2.eid JOIN Aircraft AS T3 ON T3.aid = T2.aid WHERE T3.name = "Airbus A340-300";

-- Database schema | flight : flno [ INT ] primary_key , origin [ TEXT ] , destination [ TEXT ] , distance [ INT ] , departure_date [ TEXT ] , arrival_date [ TEXT ] , price [ INT ] , aid [ INT ] flight.aid = aircraft.aid | aircraft : aid [ INT ] primary_key , name [ TEXT ] , distance [ INT ] | employee : eid [ INT ] primary_key , name [ TEXT ] , salary [ INT ] | certificate : eid [ INT ] primary_key certificate.eid = employee.eid , aid [ INT ] certificate.aid = aircraft.aid | -- -- Show names for all employees who do not have certificate of Boeing 737-800.

SELECT name FROM Employee EXCEPT SELECT T1.name FROM Employee AS T1 JOIN Certificate AS T2 ON T1.eid = T2.eid JOIN Aircraft AS T3 ON T3.aid = T2.aid WHERE T3.name = "Boeing 737-800";

-- Database schema | flight : flno [ INT ] primary_key , origin [ TEXT ] , destination [ TEXT ] , distance [ INT ] , departure_date [ TEXT ] , arrival_date [ TEXT ] , price [ INT ] , aid [ INT ] flight.aid = aircraft.aid | aircraft : aid [ INT ] primary_key , name [ TEXT ] , distance [ INT ] | employee : eid [ INT ] primary_key , name [ TEXT ] , salary [ INT ] | certificate : eid [ INT ] primary_key certificate.eid = employee.eid , aid [ INT ] certificate.aid = aircraft.aid | -- -- What are the names of all employees who are not certified to fly Boeing 737-800s?

SELECT name FROM Employee EXCEPT SELECT T1.name FROM Employee AS T1 JOIN Certificate AS T2 ON T1.eid = T2.eid JOIN Aircraft AS T3 ON T3.aid = T2.aid WHERE T3.name = "Boeing 737-800";

-- Database schema | flight : flno [ INT ] primary_key , origin [ TEXT ] , destination [ TEXT ] , distance [ INT ] , departure_date [ TEXT ] , arrival_date [ TEXT ] , price [ INT ] , aid [ INT ] flight.aid = aircraft.aid | aircraft : aid [ INT ] primary_key , name [ TEXT ] , distance [ INT ] | employee : eid [ INT ] primary_key , name [ TEXT ] , salary [ INT ] | certificate : eid [ INT ] primary_key certificate.eid = employee.eid , aid [ INT ] certificate.aid = aircraft.aid | -- -- Show the name of aircraft which fewest people have its certificate.

SELECT T2.name FROM Certificate AS T1 JOIN Aircraft AS T2 ON T2.aid = T1.aid GROUP BY T1.aid ORDER BY count(*) DESC LIMIT 1;

-- Database schema | flight : flno [ INT ] primary_key , origin [ TEXT ] , destination [ TEXT ] , distance [ INT ] , departure_date [ TEXT ] , arrival_date [ TEXT ] , price [ INT ] , aid [ INT ] flight.aid = aircraft.aid | aircraft : aid [ INT ] primary_key , name [ TEXT ] , distance [ INT ] | employee : eid [ INT ] primary_key , name [ TEXT ] , salary [ INT ] | certificate : eid [ INT ] primary_key certificate.eid = employee.eid , aid [ INT ] certificate.aid = aircraft.aid | -- -- What are the names of the aircraft that the least people are certified to fly?

SELECT T2.name FROM Certificate AS T1 JOIN Aircraft AS T2 ON T2.aid = T1.aid GROUP BY T1.aid ORDER BY count(*) DESC LIMIT 1;

-- Database schema | flight : flno [ INT ] primary_key , origin [ TEXT ] , destination [ TEXT ] , distance [ INT ] , departure_date [ TEXT ] , arrival_date [ TEXT ] , price [ INT ] , aid [ INT ] flight.aid = aircraft.aid | aircraft : aid [ INT ] primary_key , name [ TEXT ] , distance [ INT ] | employee : eid [ INT ] primary_key , name [ TEXT ] , salary [ INT ] | certificate : eid [ INT ] primary_key certificate.eid = employee.eid , aid [ INT ] certificate.aid = aircraft.aid | -- -- Show the name and distance of the aircrafts with more than 5000 distance and which at least 5 people have its certificate.

SELECT T2.name FROM Certificate AS T1 JOIN Aircraft AS T2 ON T2.aid = T1.aid WHERE T2.distance > 5000 GROUP BY T1.aid ORDER BY count(*) >= 5;

-- Database schema | flight : flno [ INT ] primary_key , origin [ TEXT ] , destination [ TEXT ] , distance [ INT ] , departure_date [ TEXT ] , arrival_date [ TEXT ] , price [ INT ] , aid [ INT ] flight.aid = aircraft.aid | aircraft : aid [ INT ] primary_key , name [ TEXT ] , distance [ INT ] | employee : eid [ INT ] primary_key , name [ TEXT ] , salary [ INT ] | certificate : eid [ INT ] primary_key certificate.eid = employee.eid , aid [ INT ] certificate.aid = aircraft.aid | -- -- What is the name and distance of every aircraft that can cover a distance of more than 5000 and which at least 5 people can fly?

SELECT T2.name FROM Certificate AS T1 JOIN Aircraft AS T2 ON T2.aid = T1.aid WHERE T2.distance > 5000 GROUP BY T1.aid ORDER BY count(*) >= 5;

-- Database schema | flight : flno [ INT ] primary_key , origin [ TEXT ] , destination [ TEXT ] , distance [ INT ] , departure_date [ TEXT ] , arrival_date [ TEXT ] , price [ INT ] , aid [ INT ] flight.aid = aircraft.aid | aircraft : aid [ INT ] primary_key , name [ TEXT ] , distance [ INT ] | employee : eid [ INT ] primary_key , name [ TEXT ] , salary [ INT ] | certificate : eid [ INT ] primary_key certificate.eid = employee.eid , aid [ INT ] certificate.aid = aircraft.aid | -- -- what is the salary and name of the employee who has the most number of aircraft certificates?

SELECT T1.name , T1.salary FROM Employee AS T1 JOIN Certificate AS T2 ON T1.eid = T2.eid GROUP BY T1.eid ORDER BY count(*) DESC LIMIT 1;

-- Database schema | flight : flno [ INT ] primary_key , origin [ TEXT ] , destination [ TEXT ] , distance [ INT ] , departure_date [ TEXT ] , arrival_date [ TEXT ] , price [ INT ] , aid [ INT ] flight.aid = aircraft.aid | aircraft : aid [ INT ] primary_key , name [ TEXT ] , distance [ INT ] | employee : eid [ INT ] primary_key , name [ TEXT ] , salary [ INT ] | certificate : eid [ INT ] primary_key certificate.eid = employee.eid , aid [ INT ] certificate.aid = aircraft.aid | -- -- What is the salaray and name of the employee that is certified to fly the most planes?

SELECT T1.name , T1.salary FROM Employee AS T1 JOIN Certificate AS T2 ON T1.eid = T2.eid GROUP BY T1.eid ORDER BY count(*) DESC LIMIT 1;

-- Database schema | flight : flno [ INT ] primary_key , origin [ TEXT ] , destination [ TEXT ] , distance [ INT ] , departure_date [ TEXT ] , arrival_date [ TEXT ] , price [ INT ] , aid [ INT ] flight.aid = aircraft.aid | aircraft : aid [ INT ] primary_key , name [ TEXT ] , distance [ INT ] | employee : eid [ INT ] primary_key , name [ TEXT ] , salary [ INT ] | certificate : eid [ INT ] primary_key certificate.eid = employee.eid , aid [ INT ] certificate.aid = aircraft.aid | -- -- What is the salary and name of the employee who has the most number of certificates on aircrafts with distance more than 5000?

SELECT T1.name FROM Employee AS T1 JOIN Certificate AS T2 ON T1.eid = T2.eid JOIN Aircraft AS T3 ON T3.aid = T2.aid WHERE T3.distance > 5000 GROUP BY T1.eid ORDER BY count(*) DESC LIMIT 1;

-- Database schema | flight : flno [ INT ] primary_key , origin [ TEXT ] , destination [ TEXT ] , distance [ INT ] , departure_date [ TEXT ] , arrival_date [ TEXT ] , price [ INT ] , aid [ INT ] flight.aid = aircraft.aid | aircraft : aid [ INT ] primary_key , name [ TEXT ] , distance [ INT ] | employee : eid [ INT ] primary_key , name [ TEXT ] , salary [ INT ] | certificate : eid [ INT ] primary_key certificate.eid = employee.eid , aid [ INT ] certificate.aid = aircraft.aid | -- -- What is the salaray and name of the employee with the most certificates to fly planes more than 5000?

SELECT T1.name FROM Employee AS T1 JOIN Certificate AS T2 ON T1.eid = T2.eid JOIN Aircraft AS T3 ON T3.aid = T2.aid WHERE T3.distance > 5000 GROUP BY T1.eid ORDER BY count(*) DESC LIMIT 1;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- How many allergies are there?

SELECT count(DISTINCT allergy) FROM Allergy_type;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- How many allergy entries are there?

SELECT count(DISTINCT allergy) FROM Allergy_type;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- How many different allergy types exist?

SELECT count(DISTINCT allergytype) FROM Allergy_type;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- How many distinct allergies are there?

SELECT count(DISTINCT allergytype) FROM Allergy_type;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- Show all allergy types.

SELECT DISTINCT allergytype FROM Allergy_type;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- What are the different allergy types?

SELECT DISTINCT allergytype FROM Allergy_type;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- Show all allergies and their types.

SELECT allergy , allergytype FROM Allergy_type;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- What are the allergies and their types?

SELECT allergy , allergytype FROM Allergy_type;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- Show all allergies with type food.

SELECT DISTINCT allergy FROM Allergy_type WHERE allergytype = "food";

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- What are all the different food allergies?

SELECT DISTINCT allergy FROM Allergy_type WHERE allergytype = "food";

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- What is the type of allergy Cat?

SELECT allergytype FROM Allergy_type WHERE allergy = "Cat";

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- What is allergy type of a cat allergy?

SELECT allergytype FROM Allergy_type WHERE allergy = "Cat";

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- How many allergies have type animal?

SELECT count(*) FROM Allergy_type WHERE allergytype = "animal";

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- How many animal type allergies exist?

SELECT count(*) FROM Allergy_type WHERE allergytype = "animal";

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- Show all allergy types and the number of allergies in each type.

SELECT allergytype , count(*) FROM Allergy_type GROUP BY allergytype;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- What are the allergy types and how many allergies correspond to each one?

SELECT allergytype , count(*) FROM Allergy_type GROUP BY allergytype;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- Which allergy type has most number of allergies?

SELECT allergytype FROM Allergy_type GROUP BY allergytype ORDER BY count(*) DESC LIMIT 1;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- Which allergy type is most common?

SELECT allergytype FROM Allergy_type GROUP BY allergytype ORDER BY count(*) DESC LIMIT 1;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- Which allergy type has least number of allergies?

SELECT allergytype FROM Allergy_type GROUP BY allergytype ORDER BY count(*) ASC LIMIT 1;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- Which allergy type is the least common?

SELECT allergytype FROM Allergy_type GROUP BY allergytype ORDER BY count(*) ASC LIMIT 1;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- How many students are there?

SELECT count(*) FROM Student;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- What is the total number of students?

SELECT count(*) FROM Student;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- Show first name and last name for all students.

SELECT Fname , Lname FROM Student;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- What are the full names of all students

SELECT Fname , Lname FROM Student;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- How many different advisors are listed?

SELECT count(DISTINCT advisor) FROM Student;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- How many advisors are there?

SELECT count(DISTINCT advisor) FROM Student;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- Show all majors.

SELECT DISTINCT Major FROM Student;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- What are the different majors?

SELECT DISTINCT Major FROM Student;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- Show all cities where students live.

SELECT DISTINCT city_code FROM Student;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- What cities do students live in?

SELECT DISTINCT city_code FROM Student;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- Show first name, last name, age for all female students. Their sex is F.

SELECT Fname , Lname , Age FROM Student WHERE Sex = 'F';

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- What are the full names and ages for all female students whose sex is F?

SELECT Fname , Lname , Age FROM Student WHERE Sex = 'F';

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- Show student ids for all male students.

SELECT StuID FROM Student WHERE Sex = 'M';

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- What are the student ids for all male students?

SELECT StuID FROM Student WHERE Sex = 'M';

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- How many students are age 18?

SELECT count(*) FROM Student WHERE age = 18;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- How many students are 18 years old?

SELECT count(*) FROM Student WHERE age = 18;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- Show all student ids who are older than 20.

SELECT StuID FROM Student WHERE age > 20;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- What are the student ids for students over 20 years old?

SELECT StuID FROM Student WHERE age > 20;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- Which city does the student whose last name is "Kim" live in?

SELECT city_code FROM Student WHERE LName = "Kim";

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- Give the city that the student whose family name is Kim lives in.

SELECT city_code FROM Student WHERE LName = "Kim";

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- Who is the advisor of student with ID 1004?

SELECT Advisor FROM Student WHERE StuID = 1004;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- Who advises student 1004?

SELECT Advisor FROM Student WHERE StuID = 1004;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- How many students live in HKG or CHI?

SELECT count(*) FROM Student WHERE city_code = "HKG" OR city_code = "CHI";

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- Give the number of students living in either HKG or CHI.

SELECT count(*) FROM Student WHERE city_code = "HKG" OR city_code = "CHI";

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- Show the minimum, average, and maximum age of all students.

SELECT min(age) , avg(age) , max(age) FROM Student;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- What is the minimum, mean, and maximum age across all students?

SELECT min(age) , avg(age) , max(age) FROM Student;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- What is the last name of the youngest student?

SELECT LName FROM Student WHERE age = (SELECT min(age) FROM Student);

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- Provide the last name of the youngest student.

SELECT LName FROM Student WHERE age = (SELECT min(age) FROM Student);

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- Show the student id of the oldest student.

SELECT StuID FROM Student WHERE age = (SELECT max(age) FROM Student);

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- What student id corresponds to the oldest student?

SELECT StuID FROM Student WHERE age = (SELECT max(age) FROM Student);

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- Show all majors and corresponding number of students.

SELECT major , count(*) FROM Student GROUP BY major;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- How many students are there for each major?

SELECT major , count(*) FROM Student GROUP BY major;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- Which major has most number of students?

SELECT major FROM Student GROUP BY major ORDER BY count(*) DESC LIMIT 1;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- What is the largest major?

SELECT major FROM Student GROUP BY major ORDER BY count(*) DESC LIMIT 1;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- Show all ages and corresponding number of students.

SELECT age , count(*) FROM Student GROUP BY age;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- How old is each student and how many students are each age?

SELECT age , count(*) FROM Student GROUP BY age;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- Show the average age for male and female students.

SELECT avg(age) , sex FROM Student GROUP BY sex;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- What are the average ages for male and female students?

SELECT avg(age) , sex FROM Student GROUP BY sex;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- Show all cities and corresponding number of students.

SELECT city_code , count(*) FROM Student GROUP BY city_code;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- How many students live in each city?

SELECT city_code , count(*) FROM Student GROUP BY city_code;

-- Database schema | Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] | -- -- Show all advisors and corresponding number of students.

SELECT advisor , count(*) FROM Student GROUP BY advisor;