mysql - #1093 - 您不能在 FROM 子句中指定要更新的目标表 'comments'

Question

我想从我的数据库中删除重复的评论

Delete FROM `comments` WHERE id IN 
(
  SELECT id
  FROM comments
  GROUP BY 
  COMMENT , course_id
  HAVING COUNT( * ) >1
)

我收到错误 #1093 -

You can't specify target table 'comments' for update in FROM clause.

我怎样才能修改我的查询以正常工作

Answer 1

尝试为子查询设置别名:

Delete FROM `comments` WHERE id IN 
(
  select id from (
      SELECT id
      FROM comments GROUP BY  `COMMENT` , course_id
      HAVING COUNT( * ) >1
  ) as comm
)