Question

我有一个'mytable'表，它有以下结构和样本数据。

+----+------------+--------------------+
| id | name       |   password         |
+----+------------+--------------------+
| 1  | Raj        |   somepwd          |
+----+------------+--------------------+
| 2  | Rao        |   abcdefg          |
+----+------------+--------------------+
| 3  | Uday       |                    |
+----+------------+--------------------+

我想用Rao的密码更新Uday的密码。任何人都可以帮我解决MySQL的更新问题。

提前致谢。

Answer 1

UPDATE mytable 
set 
  password=(SELECT password FROM mytable WHERE name LIKE 'Rao') 
WHERE name LIKE 'Uday'

Answer 2

您需要使用此查询。

update mytable as t1,
(select id,`password` from mytable where name = 'Rao') as t2
set t1.password = t2.password
where t1.id = 3

Answer 3

update mytable set password = (select password from mytable where id=2) where id=3

或者您可以使用自我加入

update mytable t1 join mytable t2 on t1.id = 3 set t1.password = t2.password
where t2.id=2

注意：使用id而不是其他列

Answer 4

我得到了解决方案，实际上，所有解决方案都给我错误。

UPDATE mytable as aa, (SELECT password FROM mytable where id =2) as bb SET aa.password=bb.password where aa.id=3;

MySQL - 使用同一个表上的子查询中的值进行更新

4 个答案: