SQL ,如何在 SQL 中用名字连接两个 ID

Question

我有两张桌子。

FIRST 表“玩家”包含：

Player_id;
Name;
Surname;

第二个表“替换”包含：

Sub_id;
In_player_id;
Out_player_id;

现在我想在sql 语言中使用select 打印in_player_id 和out_player_id 的姓名和姓氏

Answer 1

这可以使用两个JOINs 来完成：

SELECT INPLAYER.Name, INPLAYER.Surname, OUTPLAYER.Name, OUTPLAYER.Surname
FROM Substitutions
INNER JOIN Player AS INPLAYER ON (Substitutions.In_player_id = INPLAYER.Player_id)
INNER JOIN Player AS OUTPLAYER ON (Substitutions.Out_player_id = OUTPLAYER.Player_id)

对于 Oracle 数据库，删除“AS”关键字。