CREATE TABLE plays_games (stuid DECIMAL, gameid DECIMAL, hours_played DECIMAL)
CREATE TABLE video_games (gameid DECIMAL, gname TEXT, gtype TEXT)
CREATE TABLE sportsinfo (stuid DECIMAL, sportname TEXT, hoursperweek DECIMAL, gamesplayed DECIMAL, onscholarship TEXT)
CREATE TABLE student (stuid DECIMAL, lname TEXT, fname TEXT, age DECIMAL, sex TEXT, major DECIMAL, advisor DECIMAL, city_code TEXT)

How many different students play games?
SELECT COUNT(DISTINCT stuid) FROM plays_games
SELECT COUNT(DISTINCT "stuid") FROM "plays_games"