Question

我有一张这样的表（mytable）：

+------------+-----------+----------------+
| id_mytable | id_artist | foreing_column |
+------------+-----------+----------------+
|          1 |         2 |              5 |
|          2 |         1 |              5 |
|          3 |         1 |              2 |
|          4 |         3 |              6 |
+------------+-----------+----------------+

但是我只知道列foreign_column的第5个，知道这个5，我可以得到所有的id_artist（在这种情况下是2和1）

SELECT id_artist FROM `artist_band` WHERE id_band= 5

所以现在的问题是我想在这种情况下得到两个id_artist（1,2）的foreign_column，所以我最终得到这个表：

    +------------+-----------+----------------+
    | id_mytable | id_artist | foreing_column |
    +------------+-----------+----------------+
    |          1 |         2 |              5 |
    |          2 |         1 |              5 |
    |          3 |         1 |              2 |
    +------------+-----------+----------------+

（你知道所有的2和所有1都在foreign_column中）

我尝试过这样的事情：

(SELECT id_artist FROM `artist_band` as one WHERE id_band= 5)

inner join

(SELECT * FROM `artist_band` as two )

on one.id_artist = two.id_artist

或：

SELECT * FROM `artist_band` where id_artist =

(SELECT id_artist FROM `artist_band` WHERE id_band= 5)

感谢。

Answer 1

SELECT *
FROM mytable
WHERE id_artist 
IN 
 (
    SELECT id_artist 
    FROM mytable
    WHERE foreign_column = 5 -- (or whatever)
 )

Mysql - 如何让所有记录都在同一个表的其他列中

1 个答案: