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concert_singer

SELECT count(*) FROM singer

How many singers do we have?

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

easy

concert_singer

SELECT count(*) FROM singer

What is the total number of singers?

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

easy

concert_singer

SELECT name , country , age FROM singer ORDER BY age DESC

Show name, country, age for all singers ordered by age from the oldest to the youngest.

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

medium

concert_singer

SELECT name , country , age FROM singer ORDER BY age DESC

What are the names, countries, and ages for every singer in descending order of age?

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

medium

concert_singer

SELECT avg(age) , min(age) , max(age) FROM singer WHERE country = 'France'

What is the average, minimum, and maximum age of all singers from France?

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

medium

concert_singer

SELECT avg(age) , min(age) , max(age) FROM singer WHERE country = 'France'

What is the average, minimum, and maximum age for all French singers?

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

medium

concert_singer

SELECT song_name , song_release_year FROM singer ORDER BY age LIMIT 1

Show the name and the release year of the song by the youngest singer.

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

medium

concert_singer

SELECT song_name , song_release_year FROM singer ORDER BY age LIMIT 1

What are the names and release years for all the songs of the youngest singer?

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

medium

concert_singer

SELECT DISTINCT country FROM singer WHERE age > 20

What are all distinct countries where singers above age 20 are from?

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

easy

concert_singer

SELECT DISTINCT country FROM singer WHERE age > 20

What are the different countries with singers above age 20?

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

easy

concert_singer

SELECT country , count(*) FROM singer GROUP BY country

Show all countries and the number of singers in each country.

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

medium

concert_singer

SELECT country , count(*) FROM singer GROUP BY country

How many singers are from each country?

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

medium

concert_singer

SELECT song_name FROM singer WHERE age > (SELECT avg(age) FROM singer)

List all song names by singers above the average age.

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

hard

concert_singer

SELECT song_name FROM singer WHERE age > (SELECT avg(age) FROM singer)

What are all the song names by singers who are older than average?

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

hard

concert_singer

SELECT LOCATION , name FROM stadium WHERE capacity BETWEEN 5000 AND 10000

Show location and name for all stadiums with a capacity between 5000 and 10000.

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

medium

concert_singer

SELECT LOCATION , name FROM stadium WHERE capacity BETWEEN 5000 AND 10000

What are the locations and names of all stations with capacity between 5000 and 10000?

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

medium

concert_singer

select max(capacity), average from stadium

What is the maximum capacity and the average of all stadiums ?

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

medium

concert_singer

select avg(capacity) , max(capacity) from stadium

What is the average and maximum capacities for all stadiums ?

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

medium

concert_singer

SELECT name , capacity FROM stadium ORDER BY average DESC LIMIT 1

What is the name and capacity for the stadium with highest average attendance?

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

medium

concert_singer

SELECT name , capacity FROM stadium ORDER BY average DESC LIMIT 1

What is the name and capacity for the stadium with the highest average attendance?

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

medium

concert_singer

SELECT count(*) FROM concert WHERE YEAR = 2014 OR YEAR = 2015

How many concerts are there in year 2014 or 2015?

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

medium

concert_singer

SELECT count(*) FROM concert WHERE YEAR = 2014 OR YEAR = 2015

How many concerts occurred in 2014 or 2015?

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

medium

concert_singer

SELECT T2.name , count(*) FROM concert AS T1 JOIN stadium AS T2 ON T1.stadium_id = T2.stadium_id GROUP BY T1.stadium_id

Show the stadium name and the number of concerts in each stadium.

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

medium

concert_singer

SELECT T2.name , count(*) FROM concert AS T1 JOIN stadium AS T2 ON T1.stadium_id = T2.stadium_id GROUP BY T1.stadium_id

For each stadium, how many concerts play there?

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

medium

concert_singer

SELECT T2.name , T2.capacity FROM concert AS T1 JOIN stadium AS T2 ON T1.stadium_id = T2.stadium_id WHERE T1.year >= 2014 GROUP BY T2.stadium_id ORDER BY count(*) DESC LIMIT 1

Show the stadium name and capacity with most number of concerts in year 2014 or after.

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

extra

concert_singer

select t2.name , t2.capacity from concert as t1 join stadium as t2 on t1.stadium_id = t2.stadium_id where t1.year > 2013 group by t2.stadium_id order by count(*) desc limit 1

What is the name and capacity of the stadium with the most concerts after 2013 ?

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

extra

concert_singer

SELECT YEAR FROM concert GROUP BY YEAR ORDER BY count(*) DESC LIMIT 1

Which year has most number of concerts?

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

hard

concert_singer

SELECT YEAR FROM concert GROUP BY YEAR ORDER BY count(*) DESC LIMIT 1

What is the year that had the most concerts?

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

hard

concert_singer

SELECT name FROM stadium WHERE stadium_id NOT IN (SELECT stadium_id FROM concert)

Show the stadium names without any concert.

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

hard

concert_singer

SELECT name FROM stadium WHERE stadium_id NOT IN (SELECT stadium_id FROM concert)

What are the names of the stadiums without any concerts?

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

hard

concert_singer

SELECT country FROM singer WHERE age > 40 INTERSECT SELECT country FROM singer WHERE age < 30

Show countries where a singer above age 40 and a singer below 30 are from.

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

hard

concert_singer

SELECT name FROM stadium EXCEPT SELECT T2.name FROM concert AS T1 JOIN stadium AS T2 ON T1.stadium_id = T2.stadium_id WHERE T1.year = 2014

Show names for all stadiums except for stadiums having a concert in year 2014.

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

hard

concert_singer

SELECT name FROM stadium EXCEPT SELECT T2.name FROM concert AS T1 JOIN stadium AS T2 ON T1.stadium_id = T2.stadium_id WHERE T1.year = 2014

What are the names of all stadiums that did not have a concert in 2014?

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

hard

concert_singer

SELECT T2.concert_name , T2.theme , count(*) FROM singer_in_concert AS T1 JOIN concert AS T2 ON T1.concert_id = T2.concert_id GROUP BY T2.concert_id

Show the name and theme for all concerts and the number of singers in each concert.

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

medium

concert_singer

select t2.concert_name , t2.theme , count(*) from singer_in_concert as t1 join concert as t2 on t1.concert_id = t2.concert_id group by t2.concert_id

What are the names , themes , and number of singers for every concert ?

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

medium

concert_singer

SELECT T2.name , count(*) FROM singer_in_concert AS T1 JOIN singer AS T2 ON T1.singer_id = T2.singer_id GROUP BY T2.singer_id

List singer names and number of concerts for each singer.

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

medium

concert_singer

SELECT T2.name , count(*) FROM singer_in_concert AS T1 JOIN singer AS T2 ON T1.singer_id = T2.singer_id GROUP BY T2.singer_id

What are the names of the singers and number of concerts for each person?

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

medium

concert_singer

SELECT T2.name FROM singer_in_concert AS T1 JOIN singer AS T2 ON T1.singer_id = T2.singer_id JOIN concert AS T3 ON T1.concert_id = T3.concert_id WHERE T3.year = 2014

List all singer names in concerts in year 2014.

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

hard

concert_singer

SELECT T2.name FROM singer_in_concert AS T1 JOIN singer AS T2 ON T1.singer_id = T2.singer_id JOIN concert AS T3 ON T1.concert_id = T3.concert_id WHERE T3.year = 2014

What are the names of the singers who performed in a concert in 2014?

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

hard

concert_singer

SELECT name , country FROM singer WHERE song_name LIKE '%Hey%'

what is the name and nation of the singer who have a song having 'Hey' in its name?

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

medium

concert_singer

SELECT name , country FROM singer WHERE song_name LIKE '%Hey%'

What is the name and country of origin of every singer who has a song with the word 'Hey' in its title?

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

medium

concert_singer

SELECT T2.name , T2.location FROM concert AS T1 JOIN stadium AS T2 ON T1.stadium_id = T2.stadium_id WHERE T1.Year = 2014 INTERSECT SELECT T2.name , T2.location FROM concert AS T1 JOIN stadium AS T2 ON T1.stadium_id = T2.stadium_id WHERE T1.Year = 2015

Find the name and location of the stadiums which some concerts happened in the years of both 2014 and 2015.

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

extra

concert_singer

SELECT T2.name , T2.location FROM concert AS T1 JOIN stadium AS T2 ON T1.stadium_id = T2.stadium_id WHERE T1.Year = 2014 INTERSECT SELECT T2.name , T2.location FROM concert AS T1 JOIN stadium AS T2 ON T1.stadium_id = T2.stadium_id WHERE T1.Year = 2015

What are the names and locations of the stadiums that had concerts that occurred in both 2014 and 2015?

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

extra

concert_singer

select count(*) from concert where stadium_id = (select stadium_id from stadium order by capacity desc limit 1)

Find the number of concerts happened in the stadium with the highest capacity .

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

hard

concert_singer

select count(*) from concert where stadium_id = (select stadium_id from stadium order by capacity desc limit 1)

What are the number of concerts that occurred in the stadium with the largest capacity ?

CREATE TABLE "stadium" ( "Stadium_ID" int, "Location" text, "Name" text, "Capacity" int, "Highest" int, "Lowest" int, "Average" int, PRIMARY KEY ("Stadium_ID") ); CREATE TABLE "singer" ( "Singer_ID" int, "Name" text, "Country" text, "Song_Name" text, "Song_release_year" text, "Age" int, "Is_male" bool, PRIMARY KEY ("Singer_ID") ); CREATE TABLE "concert" ( "concert_ID" int, "concert_Name" text, "Theme" text, "Stadium_ID" text, "Year" text, PRIMARY KEY ("concert_ID"), FOREIGN KEY ("Stadium_ID") REFERENCES "stadium"("Stadium_ID") ); CREATE TABLE "singer_in_concert" ( "concert_ID" int, "Singer_ID" text, PRIMARY KEY ("concert_ID","Singer_ID"), FOREIGN KEY ("concert_ID") REFERENCES "concert"("concert_ID"), FOREIGN KEY ("Singer_ID") REFERENCES "singer"("Singer_ID") );

CREATE TABLE stadium (Stadium_ID INT, Location TEXT, Name TEXT, Capacity INT, Highest INT, Lowest INT, Average INT); CREATE TABLE singer (Singer_ID INT, Name TEXT, Country TEXT, Song_Name TEXT, Song_release_year TEXT, Age INT, Is_male bool); CREATE TABLE concert (concert_ID INT, concert_Name TEXT, Theme TEXT, Stadium_ID TEXT, Year TEXT); CREATE TABLE singer_in_concert (concert_ID INT, Singer_ID TEXT);

hard

pets_1

SELECT count(*) FROM pets WHERE weight > 10

Find the number of pets whose weight is heavier than 10.

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

easy

pets_1

SELECT count(*) FROM pets WHERE weight > 10

How many pets have a greater weight than 10?

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

easy

pets_1

SELECT weight FROM pets ORDER BY pet_age LIMIT 1

Find the weight of the youngest dog.

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

medium

pets_1

SELECT weight FROM pets ORDER BY pet_age LIMIT 1

How much does the youngest dog weigh?

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

medium

pets_1

SELECT max(weight) , petType FROM pets GROUP BY petType

Find the maximum weight for each type of pet. List the maximum weight and pet type.

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

medium

pets_1

SELECT max(weight) , petType FROM pets GROUP BY petType

List the maximum weight and type for each type of pet.

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

medium

pets_1

SELECT count(*) FROM student AS T1 JOIN has_pet AS T2 ON T1.stuid = T2.stuid WHERE T1.age > 20

Find number of pets owned by students who are older than 20.

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

medium

pets_1

SELECT count(*) FROM student AS T1 JOIN has_pet AS T2 ON T1.stuid = T2.stuid WHERE T1.age > 20

How many pets are owned by students that have an age greater than 20?

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

medium

pets_1

SELECT count(*) FROM student AS T1 JOIN has_pet AS T2 ON T1.stuid = T2.stuid JOIN pets AS T3 ON T2.petid = T3.petid WHERE T1.sex = 'F' AND T3.pettype = 'dog'

Find the number of dog pets that are raised by female students (with sex F).

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

hard

pets_1

SELECT count(*) FROM student AS T1 JOIN has_pet AS T2 ON T1.stuid = T2.stuid JOIN pets AS T3 ON T2.petid = T3.petid WHERE T1.sex = 'F' AND T3.pettype = 'dog'

How many dog pets are raised by female students?

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

hard

pets_1

SELECT count(DISTINCT pettype) FROM pets

Find the number of distinct type of pets.

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

easy

pets_1

SELECT count(DISTINCT pettype) FROM pets

How many different types of pet are there?

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

easy

pets_1

SELECT DISTINCT T1.Fname FROM student AS T1 JOIN has_pet AS T2 ON T1.stuid = T2.stuid JOIN pets AS T3 ON T3.petid = T2.petid WHERE T3.pettype = 'cat' OR T3.pettype = 'dog'

Find the first name of students who have cat or dog pet.

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

extra

pets_1

SELECT DISTINCT T1.Fname FROM student AS T1 JOIN has_pet AS T2 ON T1.stuid = T2.stuid JOIN pets AS T3 ON T3.petid = T2.petid WHERE T3.pettype = 'cat' OR T3.pettype = 'dog'

What are the first names of every student who has a cat or dog as a pet?

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

extra

pets_1

select t1.fname from student as t1 join has_pet as t2 on t1.stuid = t2.stuid join pets as t3 on t3.petid = t2.petid where t3.pettype = 'cat' intersect select t1.fname from student as t1 join has_pet as t2 on t1.stuid = t2.stuid join pets as t3 on t3.petid = t2.petid where t3.pettype = 'dog'

Find the first name of students who have both cat and dog pets .

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

extra

pets_1

SELECT T1.Fname FROM student AS T1 JOIN has_pet AS T2 ON T1.stuid = T2.stuid JOIN pets AS T3 ON T3.petid = T2.petid WHERE T3.pettype = 'cat' INTERSECT SELECT T1.Fname FROM student AS T1 JOIN has_pet AS T2 ON T1.stuid = T2.stuid JOIN pets AS T3 ON T3.petid = T2.petid WHERE T3.pettype = 'dog'

What are the students' first names who have both cats and dogs as pets?

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

extra

pets_1

SELECT major , age FROM student WHERE stuid NOT IN (SELECT T1.stuid FROM student AS T1 JOIN has_pet AS T2 ON T1.stuid = T2.stuid JOIN pets AS T3 ON T3.petid = T2.petid WHERE T3.pettype = 'cat')

Find the major and age of students who do not have a cat pet.

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

extra

pets_1

SELECT major , age FROM student WHERE stuid NOT IN (SELECT T1.stuid FROM student AS T1 JOIN has_pet AS T2 ON T1.stuid = T2.stuid JOIN pets AS T3 ON T3.petid = T2.petid WHERE T3.pettype = 'cat')

What major is every student who does not own a cat as a pet, and also how old are they?

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

extra

pets_1

SELECT stuid FROM student EXCEPT SELECT T1.stuid FROM student AS T1 JOIN has_pet AS T2 ON T1.stuid = T2.stuid JOIN pets AS T3 ON T3.petid = T2.petid WHERE T3.pettype = 'cat'

Find the id of students who do not have a cat pet.

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

hard

pets_1

SELECT stuid FROM student EXCEPT SELECT T1.stuid FROM student AS T1 JOIN has_pet AS T2 ON T1.stuid = T2.stuid JOIN pets AS T3 ON T3.petid = T2.petid WHERE T3.pettype = 'cat'

What are the ids of the students who do not own cats as pets?

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

hard

pets_1

SELECT T1.fname , T1.age FROM student AS T1 JOIN has_pet AS T2 ON T1.stuid = T2.stuid JOIN pets AS T3 ON T3.petid = T2.petid WHERE T3.pettype = 'dog' AND T1.stuid NOT IN (SELECT T1.stuid FROM student AS T1 JOIN has_pet AS T2 ON T1.stuid = T2.stuid JOIN pets AS T3 ON T3.petid = T2.petid WHERE T3.pettype = 'cat')

Find the first name and age of students who have a dog but do not have a cat as a pet.

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

extra

pets_1

SELECT T1.fname , T1.age FROM student AS T1 JOIN has_pet AS T2 ON T1.stuid = T2.stuid JOIN pets AS T3 ON T3.petid = T2.petid WHERE T3.pettype = 'dog' AND T1.stuid NOT IN (SELECT T1.stuid FROM student AS T1 JOIN has_pet AS T2 ON T1.stuid = T2.stuid JOIN pets AS T3 ON T3.petid = T2.petid WHERE T3.pettype = 'cat')

What is the first name of every student who has a dog but does not have a cat?

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

extra

pets_1

SELECT pettype , weight FROM pets ORDER BY pet_age LIMIT 1

Find the type and weight of the youngest pet.

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

medium

pets_1

SELECT pettype , weight FROM pets ORDER BY pet_age LIMIT 1

What type of pet is the youngest animal, and how much does it weigh?

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

medium

pets_1

SELECT petid , weight FROM pets WHERE pet_age > 1

Find the id and weight of all pets whose age is older than 1.

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

medium

pets_1

SELECT petid , weight FROM pets WHERE pet_age > 1

What is the id and weight of every pet who is older than 1?

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

medium

pets_1

SELECT avg(pet_age) , max(pet_age) , pettype FROM pets GROUP BY pettype

Find the average and maximum age for each type of pet.

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

medium

pets_1

SELECT avg(pet_age) , max(pet_age) , pettype FROM pets GROUP BY pettype

What is the average and maximum age for each pet type?

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

medium

pets_1

SELECT avg(weight) , pettype FROM pets GROUP BY pettype

Find the average weight for each pet type.

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

medium

pets_1

SELECT avg(weight) , pettype FROM pets GROUP BY pettype

What is the average weight for each type of pet?

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

medium

pets_1

SELECT DISTINCT T1.fname , T1.age FROM student AS T1 JOIN has_pet AS T2 ON T1.stuid = T2.stuid

Find the first name and age of students who have a pet.

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

medium

pets_1

SELECT DISTINCT T1.fname , T1.age FROM student AS T1 JOIN has_pet AS T2 ON T1.stuid = T2.stuid

What are the different first names and ages of the students who do have pets?

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

medium

pets_1

SELECT T2.petid FROM student AS T1 JOIN has_pet AS T2 ON T1.stuid = T2.stuid WHERE T1.Lname = 'Smith'

Find the id of the pet owned by student whose last name is ‘Smith’.

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

medium

pets_1

SELECT T2.petid FROM student AS T1 JOIN has_pet AS T2 ON T1.stuid = T2.stuid WHERE T1.Lname = 'Smith'

What is the id of the pet owned by the student whose last name is 'Smith'?

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

medium

pets_1

SELECT count(*) , T1.stuid FROM student AS T1 JOIN has_pet AS T2 ON T1.stuid = T2.stuid GROUP BY T1.stuid

Find the number of pets for each student who has any pet and student id.

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

medium

pets_1

select count(*) , t1.stuid from student as t1 join has_pet as t2 on t1.stuid = t2.stuid group by t1.stuid

For students who have pets , how many pets does each student have ? list their ids instead of names .

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

medium

pets_1

SELECT T1.fname , T1.sex FROM student AS T1 JOIN has_pet AS T2 ON T1.stuid = T2.stuid GROUP BY T1.stuid HAVING count(*) > 1

Find the first name and gender of student who have more than one pet.

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

medium

pets_1

SELECT T1.fname , T1.sex FROM student AS T1 JOIN has_pet AS T2 ON T1.stuid = T2.stuid GROUP BY T1.stuid HAVING count(*) > 1

What is the first name and gender of the all the students who have more than one pet?

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

medium

pets_1

SELECT T1.lname FROM student AS T1 JOIN has_pet AS T2 ON T1.stuid = T2.stuid JOIN pets AS T3 ON T3.petid = T2.petid WHERE T3.pet_age = 3 AND T3.pettype = 'cat'

Find the last name of the student who has a cat that is age 3.

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

hard

pets_1

SELECT T1.lname FROM student AS T1 JOIN has_pet AS T2 ON T1.stuid = T2.stuid JOIN pets AS T3 ON T3.petid = T2.petid WHERE T3.pet_age = 3 AND T3.pettype = 'cat'

What is the last name of the student who has a cat that is 3 years old?

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

hard

pets_1

select avg(age) from student where stuid not in (select stuid from has_pet)

Find the average age of students who do not have any pet .

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

extra

pets_1

select avg(age) from student where stuid not in (select stuid from has_pet)

What is the average age for all students who do not own any pets ?

create table Student ( StuID INTEGER PRIMARY KEY, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) ); create table Has_Pet ( StuID INTEGER, PetID INTEGER, FOREIGN KEY(PetID) REFERENCES Pets(PetID), FOREIGN KEY(StuID) REFERENCES Student(StuID) ); create table Pets ( PetID INTEGER PRIMARY KEY, PetType VARCHAR(20), pet_age INTEGER, weight REAL );

CREATE TABLE Student (StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3)); CREATE TABLE Has_Pet (StuID INTEGER, PetID INTEGER); CREATE TABLE Pets (PetID INTEGER, PetType VARCHAR(20), pet_age INTEGER, weight REAL);

extra

car_1

SELECT count(*) FROM CONTINENTS;

How many continents are there?

CREATE TABLE "continents" ( "ContId" INTEGER PRIMARY KEY, "Continent" TEXT ); CREATE TABLE "countries" ( "CountryId" INTEGER PRIMARY KEY, "CountryName" TEXT, "Continent" INTEGER, FOREIGN KEY (Continent) REFERENCES continents(ContId) ); CREATE TABLE "car_makers" ( "Id" INTEGER PRIMARY KEY, "Maker" TEXT, "FullName" TEXT, "Country" TEXT, FOREIGN KEY (Country) REFERENCES countries(CountryId) ); CREATE TABLE "model_list" ( "ModelId" INTEGER PRIMARY KEY, "Maker" INTEGER, "Model" TEXT UNIQUE, FOREIGN KEY (Maker) REFERENCES car_makers (Id) ); CREATE TABLE "car_names" ( "MakeId" INTEGER PRIMARY KEY, "Model" TEXT, "Make" TEXT, FOREIGN KEY (Model) REFERENCES model_list (Model) ); CREATE TABLE "cars_data" ( "Id" INTEGER PRIMARY KEY, "MPG" TEXT, "Cylinders" INTEGER, "Edispl" REAL, "Horsepower" TEXT, "Weight" INTEGER, "Accelerate" REAL, "Year" INTEGER, FOREIGN KEY (Id) REFERENCES car_names (MakeId) );

CREATE TABLE continents (ContId INTEGER, Continent TEXT); CREATE TABLE countries (CountryId INTEGER, CountryName TEXT, Continent INTEGER); CREATE TABLE car_makers (Id INTEGER, Maker TEXT, FullName TEXT, Country TEXT); CREATE TABLE model_list (ModelId INTEGER, Maker INTEGER, Model TEXT); CREATE TABLE car_names (MakeId INTEGER, Model TEXT, Make TEXT); CREATE TABLE cars_data (Id INTEGER, MPG TEXT, Cylinders INTEGER, Edispl REAL, Horsepower TEXT, Weight INTEGER, Accelerate REAL, Year INTEGER);

easy

car_1

SELECT count(*) FROM CONTINENTS;

What is the number of continents?

CREATE TABLE "continents" ( "ContId" INTEGER PRIMARY KEY, "Continent" TEXT ); CREATE TABLE "countries" ( "CountryId" INTEGER PRIMARY KEY, "CountryName" TEXT, "Continent" INTEGER, FOREIGN KEY (Continent) REFERENCES continents(ContId) ); CREATE TABLE "car_makers" ( "Id" INTEGER PRIMARY KEY, "Maker" TEXT, "FullName" TEXT, "Country" TEXT, FOREIGN KEY (Country) REFERENCES countries(CountryId) ); CREATE TABLE "model_list" ( "ModelId" INTEGER PRIMARY KEY, "Maker" INTEGER, "Model" TEXT UNIQUE, FOREIGN KEY (Maker) REFERENCES car_makers (Id) ); CREATE TABLE "car_names" ( "MakeId" INTEGER PRIMARY KEY, "Model" TEXT, "Make" TEXT, FOREIGN KEY (Model) REFERENCES model_list (Model) ); CREATE TABLE "cars_data" ( "Id" INTEGER PRIMARY KEY, "MPG" TEXT, "Cylinders" INTEGER, "Edispl" REAL, "Horsepower" TEXT, "Weight" INTEGER, "Accelerate" REAL, "Year" INTEGER, FOREIGN KEY (Id) REFERENCES car_names (MakeId) );

CREATE TABLE continents (ContId INTEGER, Continent TEXT); CREATE TABLE countries (CountryId INTEGER, CountryName TEXT, Continent INTEGER); CREATE TABLE car_makers (Id INTEGER, Maker TEXT, FullName TEXT, Country TEXT); CREATE TABLE model_list (ModelId INTEGER, Maker INTEGER, Model TEXT); CREATE TABLE car_names (MakeId INTEGER, Model TEXT, Make TEXT); CREATE TABLE cars_data (Id INTEGER, MPG TEXT, Cylinders INTEGER, Edispl REAL, Horsepower TEXT, Weight INTEGER, Accelerate REAL, Year INTEGER);

easy

car_1

SELECT T1.ContId , T1.Continent , count(*) FROM CONTINENTS AS T1 JOIN COUNTRIES AS T2 ON T1.ContId = T2.Continent GROUP BY T1.ContId;

How many countries does each continent have? List the continent id, continent name and the number of countries.

CREATE TABLE "continents" ( "ContId" INTEGER PRIMARY KEY, "Continent" TEXT ); CREATE TABLE "countries" ( "CountryId" INTEGER PRIMARY KEY, "CountryName" TEXT, "Continent" INTEGER, FOREIGN KEY (Continent) REFERENCES continents(ContId) ); CREATE TABLE "car_makers" ( "Id" INTEGER PRIMARY KEY, "Maker" TEXT, "FullName" TEXT, "Country" TEXT, FOREIGN KEY (Country) REFERENCES countries(CountryId) ); CREATE TABLE "model_list" ( "ModelId" INTEGER PRIMARY KEY, "Maker" INTEGER, "Model" TEXT UNIQUE, FOREIGN KEY (Maker) REFERENCES car_makers (Id) ); CREATE TABLE "car_names" ( "MakeId" INTEGER PRIMARY KEY, "Model" TEXT, "Make" TEXT, FOREIGN KEY (Model) REFERENCES model_list (Model) ); CREATE TABLE "cars_data" ( "Id" INTEGER PRIMARY KEY, "MPG" TEXT, "Cylinders" INTEGER, "Edispl" REAL, "Horsepower" TEXT, "Weight" INTEGER, "Accelerate" REAL, "Year" INTEGER, FOREIGN KEY (Id) REFERENCES car_names (MakeId) );

CREATE TABLE continents (ContId INTEGER, Continent TEXT); CREATE TABLE countries (CountryId INTEGER, CountryName TEXT, Continent INTEGER); CREATE TABLE car_makers (Id INTEGER, Maker TEXT, FullName TEXT, Country TEXT); CREATE TABLE model_list (ModelId INTEGER, Maker INTEGER, Model TEXT); CREATE TABLE car_names (MakeId INTEGER, Model TEXT, Make TEXT); CREATE TABLE cars_data (Id INTEGER, MPG TEXT, Cylinders INTEGER, Edispl REAL, Horsepower TEXT, Weight INTEGER, Accelerate REAL, Year INTEGER);

medium

car_1

SELECT T1.ContId , T1.Continent , count(*) FROM CONTINENTS AS T1 JOIN COUNTRIES AS T2 ON T1.ContId = T2.Continent GROUP BY T1.ContId;

For each continent, list its id, name, and how many countries it has?

CREATE TABLE "continents" ( "ContId" INTEGER PRIMARY KEY, "Continent" TEXT ); CREATE TABLE "countries" ( "CountryId" INTEGER PRIMARY KEY, "CountryName" TEXT, "Continent" INTEGER, FOREIGN KEY (Continent) REFERENCES continents(ContId) ); CREATE TABLE "car_makers" ( "Id" INTEGER PRIMARY KEY, "Maker" TEXT, "FullName" TEXT, "Country" TEXT, FOREIGN KEY (Country) REFERENCES countries(CountryId) ); CREATE TABLE "model_list" ( "ModelId" INTEGER PRIMARY KEY, "Maker" INTEGER, "Model" TEXT UNIQUE, FOREIGN KEY (Maker) REFERENCES car_makers (Id) ); CREATE TABLE "car_names" ( "MakeId" INTEGER PRIMARY KEY, "Model" TEXT, "Make" TEXT, FOREIGN KEY (Model) REFERENCES model_list (Model) ); CREATE TABLE "cars_data" ( "Id" INTEGER PRIMARY KEY, "MPG" TEXT, "Cylinders" INTEGER, "Edispl" REAL, "Horsepower" TEXT, "Weight" INTEGER, "Accelerate" REAL, "Year" INTEGER, FOREIGN KEY (Id) REFERENCES car_names (MakeId) );

CREATE TABLE continents (ContId INTEGER, Continent TEXT); CREATE TABLE countries (CountryId INTEGER, CountryName TEXT, Continent INTEGER); CREATE TABLE car_makers (Id INTEGER, Maker TEXT, FullName TEXT, Country TEXT); CREATE TABLE model_list (ModelId INTEGER, Maker INTEGER, Model TEXT); CREATE TABLE car_names (MakeId INTEGER, Model TEXT, Make TEXT); CREATE TABLE cars_data (Id INTEGER, MPG TEXT, Cylinders INTEGER, Edispl REAL, Horsepower TEXT, Weight INTEGER, Accelerate REAL, Year INTEGER);

medium

car_1

SELECT count(*) FROM COUNTRIES;

How many countries are listed?

CREATE TABLE "continents" ( "ContId" INTEGER PRIMARY KEY, "Continent" TEXT ); CREATE TABLE "countries" ( "CountryId" INTEGER PRIMARY KEY, "CountryName" TEXT, "Continent" INTEGER, FOREIGN KEY (Continent) REFERENCES continents(ContId) ); CREATE TABLE "car_makers" ( "Id" INTEGER PRIMARY KEY, "Maker" TEXT, "FullName" TEXT, "Country" TEXT, FOREIGN KEY (Country) REFERENCES countries(CountryId) ); CREATE TABLE "model_list" ( "ModelId" INTEGER PRIMARY KEY, "Maker" INTEGER, "Model" TEXT UNIQUE, FOREIGN KEY (Maker) REFERENCES car_makers (Id) ); CREATE TABLE "car_names" ( "MakeId" INTEGER PRIMARY KEY, "Model" TEXT, "Make" TEXT, FOREIGN KEY (Model) REFERENCES model_list (Model) ); CREATE TABLE "cars_data" ( "Id" INTEGER PRIMARY KEY, "MPG" TEXT, "Cylinders" INTEGER, "Edispl" REAL, "Horsepower" TEXT, "Weight" INTEGER, "Accelerate" REAL, "Year" INTEGER, FOREIGN KEY (Id) REFERENCES car_names (MakeId) );

CREATE TABLE continents (ContId INTEGER, Continent TEXT); CREATE TABLE countries (CountryId INTEGER, CountryName TEXT, Continent INTEGER); CREATE TABLE car_makers (Id INTEGER, Maker TEXT, FullName TEXT, Country TEXT); CREATE TABLE model_list (ModelId INTEGER, Maker INTEGER, Model TEXT); CREATE TABLE car_names (MakeId INTEGER, Model TEXT, Make TEXT); CREATE TABLE cars_data (Id INTEGER, MPG TEXT, Cylinders INTEGER, Edispl REAL, Horsepower TEXT, Weight INTEGER, Accelerate REAL, Year INTEGER);

easy

car_1

SELECT count(*) FROM COUNTRIES;

How many countries exist?

CREATE TABLE "continents" ( "ContId" INTEGER PRIMARY KEY, "Continent" TEXT ); CREATE TABLE "countries" ( "CountryId" INTEGER PRIMARY KEY, "CountryName" TEXT, "Continent" INTEGER, FOREIGN KEY (Continent) REFERENCES continents(ContId) ); CREATE TABLE "car_makers" ( "Id" INTEGER PRIMARY KEY, "Maker" TEXT, "FullName" TEXT, "Country" TEXT, FOREIGN KEY (Country) REFERENCES countries(CountryId) ); CREATE TABLE "model_list" ( "ModelId" INTEGER PRIMARY KEY, "Maker" INTEGER, "Model" TEXT UNIQUE, FOREIGN KEY (Maker) REFERENCES car_makers (Id) ); CREATE TABLE "car_names" ( "MakeId" INTEGER PRIMARY KEY, "Model" TEXT, "Make" TEXT, FOREIGN KEY (Model) REFERENCES model_list (Model) ); CREATE TABLE "cars_data" ( "Id" INTEGER PRIMARY KEY, "MPG" TEXT, "Cylinders" INTEGER, "Edispl" REAL, "Horsepower" TEXT, "Weight" INTEGER, "Accelerate" REAL, "Year" INTEGER, FOREIGN KEY (Id) REFERENCES car_names (MakeId) );

CREATE TABLE continents (ContId INTEGER, Continent TEXT); CREATE TABLE countries (CountryId INTEGER, CountryName TEXT, Continent INTEGER); CREATE TABLE car_makers (Id INTEGER, Maker TEXT, FullName TEXT, Country TEXT); CREATE TABLE model_list (ModelId INTEGER, Maker INTEGER, Model TEXT); CREATE TABLE car_names (MakeId INTEGER, Model TEXT, Make TEXT); CREATE TABLE cars_data (Id INTEGER, MPG TEXT, Cylinders INTEGER, Edispl REAL, Horsepower TEXT, Weight INTEGER, Accelerate REAL, Year INTEGER);

easy

car_1

SELECT T1.FullName , T1.Id , count(*) FROM CAR_MAKERS AS T1 JOIN MODEL_LIST AS T2 ON T1.Id = T2.Maker GROUP BY T1.Id;

How many models does each car maker produce? List maker full name, id and the number.

CREATE TABLE "continents" ( "ContId" INTEGER PRIMARY KEY, "Continent" TEXT ); CREATE TABLE "countries" ( "CountryId" INTEGER PRIMARY KEY, "CountryName" TEXT, "Continent" INTEGER, FOREIGN KEY (Continent) REFERENCES continents(ContId) ); CREATE TABLE "car_makers" ( "Id" INTEGER PRIMARY KEY, "Maker" TEXT, "FullName" TEXT, "Country" TEXT, FOREIGN KEY (Country) REFERENCES countries(CountryId) ); CREATE TABLE "model_list" ( "ModelId" INTEGER PRIMARY KEY, "Maker" INTEGER, "Model" TEXT UNIQUE, FOREIGN KEY (Maker) REFERENCES car_makers (Id) ); CREATE TABLE "car_names" ( "MakeId" INTEGER PRIMARY KEY, "Model" TEXT, "Make" TEXT, FOREIGN KEY (Model) REFERENCES model_list (Model) ); CREATE TABLE "cars_data" ( "Id" INTEGER PRIMARY KEY, "MPG" TEXT, "Cylinders" INTEGER, "Edispl" REAL, "Horsepower" TEXT, "Weight" INTEGER, "Accelerate" REAL, "Year" INTEGER, FOREIGN KEY (Id) REFERENCES car_names (MakeId) );

CREATE TABLE continents (ContId INTEGER, Continent TEXT); CREATE TABLE countries (CountryId INTEGER, CountryName TEXT, Continent INTEGER); CREATE TABLE car_makers (Id INTEGER, Maker TEXT, FullName TEXT, Country TEXT); CREATE TABLE model_list (ModelId INTEGER, Maker INTEGER, Model TEXT); CREATE TABLE car_names (MakeId INTEGER, Model TEXT, Make TEXT); CREATE TABLE cars_data (Id INTEGER, MPG TEXT, Cylinders INTEGER, Edispl REAL, Horsepower TEXT, Weight INTEGER, Accelerate REAL, Year INTEGER);

medium

car_1

SELECT T1.FullName , T1.Id , count(*) FROM CAR_MAKERS AS T1 JOIN MODEL_LIST AS T2 ON T1.Id = T2.Maker GROUP BY T1.Id;

What is the full name of each car maker, along with its id and how many models it produces?

CREATE TABLE "continents" ( "ContId" INTEGER PRIMARY KEY, "Continent" TEXT ); CREATE TABLE "countries" ( "CountryId" INTEGER PRIMARY KEY, "CountryName" TEXT, "Continent" INTEGER, FOREIGN KEY (Continent) REFERENCES continents(ContId) ); CREATE TABLE "car_makers" ( "Id" INTEGER PRIMARY KEY, "Maker" TEXT, "FullName" TEXT, "Country" TEXT, FOREIGN KEY (Country) REFERENCES countries(CountryId) ); CREATE TABLE "model_list" ( "ModelId" INTEGER PRIMARY KEY, "Maker" INTEGER, "Model" TEXT UNIQUE, FOREIGN KEY (Maker) REFERENCES car_makers (Id) ); CREATE TABLE "car_names" ( "MakeId" INTEGER PRIMARY KEY, "Model" TEXT, "Make" TEXT, FOREIGN KEY (Model) REFERENCES model_list (Model) ); CREATE TABLE "cars_data" ( "Id" INTEGER PRIMARY KEY, "MPG" TEXT, "Cylinders" INTEGER, "Edispl" REAL, "Horsepower" TEXT, "Weight" INTEGER, "Accelerate" REAL, "Year" INTEGER, FOREIGN KEY (Id) REFERENCES car_names (MakeId) );

CREATE TABLE continents (ContId INTEGER, Continent TEXT); CREATE TABLE countries (CountryId INTEGER, CountryName TEXT, Continent INTEGER); CREATE TABLE car_makers (Id INTEGER, Maker TEXT, FullName TEXT, Country TEXT); CREATE TABLE model_list (ModelId INTEGER, Maker INTEGER, Model TEXT); CREATE TABLE car_names (MakeId INTEGER, Model TEXT, Make TEXT); CREATE TABLE cars_data (Id INTEGER, MPG TEXT, Cylinders INTEGER, Edispl REAL, Horsepower TEXT, Weight INTEGER, Accelerate REAL, Year INTEGER);

medium

car_1

SELECT T1.Model FROM CAR_NAMES AS T1 JOIN CARS_DATA AS T2 ON T1.MakeId = T2.Id ORDER BY T2.horsepower ASC LIMIT 1;

Which model of the car has the minimum horsepower?

CREATE TABLE "continents" ( "ContId" INTEGER PRIMARY KEY, "Continent" TEXT ); CREATE TABLE "countries" ( "CountryId" INTEGER PRIMARY KEY, "CountryName" TEXT, "Continent" INTEGER, FOREIGN KEY (Continent) REFERENCES continents(ContId) ); CREATE TABLE "car_makers" ( "Id" INTEGER PRIMARY KEY, "Maker" TEXT, "FullName" TEXT, "Country" TEXT, FOREIGN KEY (Country) REFERENCES countries(CountryId) ); CREATE TABLE "model_list" ( "ModelId" INTEGER PRIMARY KEY, "Maker" INTEGER, "Model" TEXT UNIQUE, FOREIGN KEY (Maker) REFERENCES car_makers (Id) ); CREATE TABLE "car_names" ( "MakeId" INTEGER PRIMARY KEY, "Model" TEXT, "Make" TEXT, FOREIGN KEY (Model) REFERENCES model_list (Model) ); CREATE TABLE "cars_data" ( "Id" INTEGER PRIMARY KEY, "MPG" TEXT, "Cylinders" INTEGER, "Edispl" REAL, "Horsepower" TEXT, "Weight" INTEGER, "Accelerate" REAL, "Year" INTEGER, FOREIGN KEY (Id) REFERENCES car_names (MakeId) );

CREATE TABLE continents (ContId INTEGER, Continent TEXT); CREATE TABLE countries (CountryId INTEGER, CountryName TEXT, Continent INTEGER); CREATE TABLE car_makers (Id INTEGER, Maker TEXT, FullName TEXT, Country TEXT); CREATE TABLE model_list (ModelId INTEGER, Maker INTEGER, Model TEXT); CREATE TABLE car_names (MakeId INTEGER, Model TEXT, Make TEXT); CREATE TABLE cars_data (Id INTEGER, MPG TEXT, Cylinders INTEGER, Edispl REAL, Horsepower TEXT, Weight INTEGER, Accelerate REAL, Year INTEGER);

hard

car_1

SELECT T1.Model FROM CAR_NAMES AS T1 JOIN CARS_DATA AS T2 ON T1.MakeId = T2.Id ORDER BY T2.horsepower ASC LIMIT 1;

What is the model of the car with the smallest amount of horsepower?

CREATE TABLE "continents" ( "ContId" INTEGER PRIMARY KEY, "Continent" TEXT ); CREATE TABLE "countries" ( "CountryId" INTEGER PRIMARY KEY, "CountryName" TEXT, "Continent" INTEGER, FOREIGN KEY (Continent) REFERENCES continents(ContId) ); CREATE TABLE "car_makers" ( "Id" INTEGER PRIMARY KEY, "Maker" TEXT, "FullName" TEXT, "Country" TEXT, FOREIGN KEY (Country) REFERENCES countries(CountryId) ); CREATE TABLE "model_list" ( "ModelId" INTEGER PRIMARY KEY, "Maker" INTEGER, "Model" TEXT UNIQUE, FOREIGN KEY (Maker) REFERENCES car_makers (Id) ); CREATE TABLE "car_names" ( "MakeId" INTEGER PRIMARY KEY, "Model" TEXT, "Make" TEXT, FOREIGN KEY (Model) REFERENCES model_list (Model) ); CREATE TABLE "cars_data" ( "Id" INTEGER PRIMARY KEY, "MPG" TEXT, "Cylinders" INTEGER, "Edispl" REAL, "Horsepower" TEXT, "Weight" INTEGER, "Accelerate" REAL, "Year" INTEGER, FOREIGN KEY (Id) REFERENCES car_names (MakeId) );

CREATE TABLE continents (ContId INTEGER, Continent TEXT); CREATE TABLE countries (CountryId INTEGER, CountryName TEXT, Continent INTEGER); CREATE TABLE car_makers (Id INTEGER, Maker TEXT, FullName TEXT, Country TEXT); CREATE TABLE model_list (ModelId INTEGER, Maker INTEGER, Model TEXT); CREATE TABLE car_names (MakeId INTEGER, Model TEXT, Make TEXT); CREATE TABLE cars_data (Id INTEGER, MPG TEXT, Cylinders INTEGER, Edispl REAL, Horsepower TEXT, Weight INTEGER, Accelerate REAL, Year INTEGER);

hard

car_1

SELECT T1.model FROM CAR_NAMES AS T1 JOIN CARS_DATA AS T2 ON T1.MakeId = T2.Id WHERE T2.Weight < (SELECT avg(Weight) FROM CARS_DATA)

Find the model of the car whose weight is below the average weight.

CREATE TABLE "continents" ( "ContId" INTEGER PRIMARY KEY, "Continent" TEXT ); CREATE TABLE "countries" ( "CountryId" INTEGER PRIMARY KEY, "CountryName" TEXT, "Continent" INTEGER, FOREIGN KEY (Continent) REFERENCES continents(ContId) ); CREATE TABLE "car_makers" ( "Id" INTEGER PRIMARY KEY, "Maker" TEXT, "FullName" TEXT, "Country" TEXT, FOREIGN KEY (Country) REFERENCES countries(CountryId) ); CREATE TABLE "model_list" ( "ModelId" INTEGER PRIMARY KEY, "Maker" INTEGER, "Model" TEXT UNIQUE, FOREIGN KEY (Maker) REFERENCES car_makers (Id) ); CREATE TABLE "car_names" ( "MakeId" INTEGER PRIMARY KEY, "Model" TEXT, "Make" TEXT, FOREIGN KEY (Model) REFERENCES model_list (Model) ); CREATE TABLE "cars_data" ( "Id" INTEGER PRIMARY KEY, "MPG" TEXT, "Cylinders" INTEGER, "Edispl" REAL, "Horsepower" TEXT, "Weight" INTEGER, "Accelerate" REAL, "Year" INTEGER, FOREIGN KEY (Id) REFERENCES car_names (MakeId) );

CREATE TABLE continents (ContId INTEGER, Continent TEXT); CREATE TABLE countries (CountryId INTEGER, CountryName TEXT, Continent INTEGER); CREATE TABLE car_makers (Id INTEGER, Maker TEXT, FullName TEXT, Country TEXT); CREATE TABLE model_list (ModelId INTEGER, Maker INTEGER, Model TEXT); CREATE TABLE car_names (MakeId INTEGER, Model TEXT, Make TEXT); CREATE TABLE cars_data (Id INTEGER, MPG TEXT, Cylinders INTEGER, Edispl REAL, Horsepower TEXT, Weight INTEGER, Accelerate REAL, Year INTEGER);

extra

car_1

SELECT T1.model FROM CAR_NAMES AS T1 JOIN CARS_DATA AS T2 ON T1.MakeId = T2.Id WHERE T2.Weight < (SELECT avg(Weight) FROM CARS_DATA)

What is the model for the car with a weight smaller than the average?

CREATE TABLE "continents" ( "ContId" INTEGER PRIMARY KEY, "Continent" TEXT ); CREATE TABLE "countries" ( "CountryId" INTEGER PRIMARY KEY, "CountryName" TEXT, "Continent" INTEGER, FOREIGN KEY (Continent) REFERENCES continents(ContId) ); CREATE TABLE "car_makers" ( "Id" INTEGER PRIMARY KEY, "Maker" TEXT, "FullName" TEXT, "Country" TEXT, FOREIGN KEY (Country) REFERENCES countries(CountryId) ); CREATE TABLE "model_list" ( "ModelId" INTEGER PRIMARY KEY, "Maker" INTEGER, "Model" TEXT UNIQUE, FOREIGN KEY (Maker) REFERENCES car_makers (Id) ); CREATE TABLE "car_names" ( "MakeId" INTEGER PRIMARY KEY, "Model" TEXT, "Make" TEXT, FOREIGN KEY (Model) REFERENCES model_list (Model) ); CREATE TABLE "cars_data" ( "Id" INTEGER PRIMARY KEY, "MPG" TEXT, "Cylinders" INTEGER, "Edispl" REAL, "Horsepower" TEXT, "Weight" INTEGER, "Accelerate" REAL, "Year" INTEGER, FOREIGN KEY (Id) REFERENCES car_names (MakeId) );

CREATE TABLE continents (ContId INTEGER, Continent TEXT); CREATE TABLE countries (CountryId INTEGER, CountryName TEXT, Continent INTEGER); CREATE TABLE car_makers (Id INTEGER, Maker TEXT, FullName TEXT, Country TEXT); CREATE TABLE model_list (ModelId INTEGER, Maker INTEGER, Model TEXT); CREATE TABLE car_names (MakeId INTEGER, Model TEXT, Make TEXT); CREATE TABLE cars_data (Id INTEGER, MPG TEXT, Cylinders INTEGER, Edispl REAL, Horsepower TEXT, Weight INTEGER, Accelerate REAL, Year INTEGER);

extra

car_1

SELECT DISTINCT T1.Maker FROM CAR_MAKERS AS T1 JOIN MODEL_LIST AS T2 ON T1.Id = T2.Maker JOIN CAR_NAMES AS T3 ON T2.model = T3.model JOIN CARS_DATA AS T4 ON T3.MakeId = T4.id WHERE T4.year = '1970';

Find the name of the makers that produced some cars in the year of 1970?

CREATE TABLE "continents" ( "ContId" INTEGER PRIMARY KEY, "Continent" TEXT ); CREATE TABLE "countries" ( "CountryId" INTEGER PRIMARY KEY, "CountryName" TEXT, "Continent" INTEGER, FOREIGN KEY (Continent) REFERENCES continents(ContId) ); CREATE TABLE "car_makers" ( "Id" INTEGER PRIMARY KEY, "Maker" TEXT, "FullName" TEXT, "Country" TEXT, FOREIGN KEY (Country) REFERENCES countries(CountryId) ); CREATE TABLE "model_list" ( "ModelId" INTEGER PRIMARY KEY, "Maker" INTEGER, "Model" TEXT UNIQUE, FOREIGN KEY (Maker) REFERENCES car_makers (Id) ); CREATE TABLE "car_names" ( "MakeId" INTEGER PRIMARY KEY, "Model" TEXT, "Make" TEXT, FOREIGN KEY (Model) REFERENCES model_list (Model) ); CREATE TABLE "cars_data" ( "Id" INTEGER PRIMARY KEY, "MPG" TEXT, "Cylinders" INTEGER, "Edispl" REAL, "Horsepower" TEXT, "Weight" INTEGER, "Accelerate" REAL, "Year" INTEGER, FOREIGN KEY (Id) REFERENCES car_names (MakeId) );

CREATE TABLE continents (ContId INTEGER, Continent TEXT); CREATE TABLE countries (CountryId INTEGER, CountryName TEXT, Continent INTEGER); CREATE TABLE car_makers (Id INTEGER, Maker TEXT, FullName TEXT, Country TEXT); CREATE TABLE model_list (ModelId INTEGER, Maker INTEGER, Model TEXT); CREATE TABLE car_names (MakeId INTEGER, Model TEXT, Make TEXT); CREATE TABLE cars_data (Id INTEGER, MPG TEXT, Cylinders INTEGER, Edispl REAL, Horsepower TEXT, Weight INTEGER, Accelerate REAL, Year INTEGER);

extra