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我有一个游戏,桌子看起来像:

// users
user_id | favorite_color

// games
game_id | game_name

// game_participants
id | fk_game_id | fk_user_id

我想在特定游戏中获得所有用户最喜欢的颜色。我可以通过几个步骤来做到这一点,例如:

// get the game.
Game game =  select * from games where game_id = 'abc';

// get each user's favorite color, one at a time.
for (participants in game) {
    select favorite_color from users where user_id = game.participants[i].id;
}

但是有没有办法在一个选择语句中做到这一点?

谢谢

4

2 回答 2

1
SELECT favorite_color
FROM games 
    INNER JOIN game_participants on games.game_id = game_participants.fk_game_id
    INNER JOIN users on users.user_id = game_participants.fk_user_id
WHERE game_id = 'abc'
于 2012-07-22T23:16:45.803 回答
1
SELECT users.favourite_color
FROM game_participants 
    INNER JOIN users ON game_participants.fk_user_id = users.user_id
WHERE fk_game_id = 'abc'
于 2012-07-22T23:22:30.383 回答