Question

我有这张桌子：

// mytable
+----+---------+
| id | related |
+----+---------+
| 1  | 1       |
| 2  | 1       |
| 3  | 2       |
| 4  | 1       |
| 5  | 3       |
| 6  | 2       |
| 7  | 4       |
| 8  | 4       |
| 9  | 2       |
+----+---------+

我只有$id = 6这样的身份证号码。我想选择所有具有相同related的行。所以这是预期的结果：

// newmytable
+----+---------+
| id | related |
+----+---------+
| 3  | 2       |
| 6  | 2       |
| 9  | 2       |
+----+---------+

我该怎么做？

这是我的查询但不起作用：

SELECT * 
FROM mytable m 
WHERE (SELECT related 
             FROM mytable 
             WHERE id = :id) t m.related = t.related

Answer 1

这将有效

SELECT * FROM mytable WHERE related = (SELECT releated FROM mytable WHERE id = 6)

Answer 2

select m2.id, m2.related
from 
mytable m1
join mytable m2
on m2.related = m1.related 
where m1.id = 6

SQL Fiddle sample

Answer 3

SELECT * FROM mytable
WHERE related = ( SELECT related FROM mytable WHERE id = 6)

未经测试......

Answer 4

试试这个

select *from mytable 
where related = (select related from mytable where id = 6)

Answer 5

您好请用以下查询替换您的查询，您将获得预期的输出。

SELECT * FROM mytable WHERE =（SELECT related FROM mytable WHERE id =：id）

如何通过只有一个ID号来选择相关列？

5 个答案: