mysql - 在 MySql 中更新连接两个表

Question

我在 mysql 数据库中有两个表:

1) dotable_new;

2) dotable_new_new

现在我需要将表 dotable_new 中的值 TOTAL 更新为表 dotable_new_new 中的值 TOTAL。

我正在尝试此更新查询，但没有成功...你能帮助我吗？

UPDATE dotable_new a, dotable_new_new tmp
SET a.total = tmp.total
WHERE
    a.rdt IN ('tot mac')

dotable_new;

+---------+---------------+--------+-------+----+
| RDT     | TYPE          | NUMBER | TOTAL | ID |
+---------+---------------+--------+-------+----+
| tot mac | tot           |   3209 |  3249 |  1 |
+---------+---------------+--------+-------+----+

dotable_new_new

+---------+-------+----+
| RDT     | TOTAL | ID |
+---------+-------+----+
| tot mac | 10899 |  5 |
+---------+-------+----+

Answer 1

检查这对您有帮助 how to join two tables in update

尝试一下:

  UPDATE dotable_new a
  INNER JOIN dotable_new_new tmp ON tmp.rdt = a.rdt
  SET a.total =  tmp.total
  WHERE a.rdt = 'tot mac'