从带有外键的3个表中选择Query

Question

我有3个彼此有外键的表。 我想编写一个SQL Server存储过程来从其中一个中选择记录。

现在，让我们假设我想要所有Winner记录引用玩家记录引用ID为2的游戏，我该如何进行？

谢谢。

Answer 1

您已指定所有获胜者记录因此我已将左连接用于玩家和游戏。但整体代码根据where条件工作。

试试这个，

select w.* from Winner w
left Join Player p on p.ID_player = w.player_FK
left join Game g on g.ID_game = p.Game_FK
where  Game.ID_game = 2

Answer 2

您需要使用SELECT和INNER JOIN然后过滤GameID 2，您可以使用WHERE子句。

SELECT ID_Winner, Name, Lastname, Player_FK
FROM Winner
INNER JOIN Player on Player.ID_Pplayer = Winner.Player_FK
INNER JOIN Game ON Game.ID_game = Player.Game_FK
WHERE Game.ID_game = 2