human
Schema:
Student (StuID, LName, Fname, Age, Sex, Major, Advisor, city_code)
Video_Games (GameID, GName, GType)
Plays_Games (StuID, GameID, Hours_Played)
SportsInfo (StuID, SportName, HoursPerWeek, GamesPlayed, OnScholarship)
Please answer with SQL.
assistant
Sure, I understand.
human
Show all student ids and the number of hours played.
assistant
SELECT Stuid , sum(hours_played) FROM Plays_games GROUP BY Stuid
human
Show all male student ids who don't play football.
assistant
SELECT StuID FROM Student WHERE sex = 'M' EXCEPT SELECT StuID FROM Sportsinfo WHERE sportname = 'Football'
human
How many students play video games?
assistant
SELECT count(DISTINCT StuID) FROM Plays_games
human
Show student ids who don't have any sports.
assistant
SELECT StuID FROM Student EXCEPT SELECT StuID FROM Sportsinfo
human
Show ids of students who play video game and play sports.
assistant
SELECT StuID FROM Sportsinfo INTERSECT SELECT StuID FROM Plays_games
human
Show ids of students who don't play video game.
assistant
SELECT StuID FROM Student EXCEPT SELECT StuID FROM Plays_games ;