根据 id 分组和连接两个表？

Question

我有一个看起来像这样的 mysql 表：

id | name
-----------
1  |  cola
2  |  pepsi
3  |  sprite

和其他表：

costumer | buy1 | buy2
----------------------
Jhon     | 2    | 3
Alice    | 1    | 3
Tony     | 3    | 2

我想加入这两个表并生成

 costumer | buy1 | buy2
----------------------
Jhon     | Pepsi | Sprite
Alice    | Cola  | Sprite
Tony     | Sprite| Pepsi

Answer 1

 SELECT C.costumer,REF.NAME,REF2.NAME
 FROM OTHER_TABLE AS C
 JOIN TABLE_SOMETHING_LIKE_THIS AS REF ON C.BUY1=REF.ID
 JOIN TABLE_SOMETHING_LIKE_THIS AS REF2 ON C.BUY2=REF2.ID

Answer 2

您可以在 select 列表中编写子查询，如下所示：

select costumer,
  (select name from tbl1 where id=buy1) buy1,
  (select name from tbl1 where id=buy2) buy2
from tbl2;