[Err] 1093 - You can't specify target table 'xxx' for update in FROM clause解决方法

执行开发同学提供的删除数据的sql时报错[Err] 1093 - You can't specify target table 'run_result' for update in FROM clause
查了相关的资料，这个报错的大概意思是不能按照查出的某些值再更新这张表。原来的语句为

DELETE
FROM
	run_result
WHERE
	fid IN (
		SELECT
			a.fid
		FROM
			run_result a
		INNER JOIN org b ON a.frunorg = b.fid
		WHERE
			b.forgpatternid <> 1
	)

解决方法：将select出的结果再通过中间表select一遍，修改后的sql为

DELETE
FROM
 run_resultt
WHERE
 fid IN (SELECT
  a.fid
 FROM
  (
   SELECT
    a.fid
   FROM
   run_result a
   INNER JOIN org b ON a.frunorg = b.fid
   WHERE
    b.forgpatternid <> 1
  )a
)