You can't specify target table 'dt_task_apply' for update in FROM clause sql 关联查询并删除

两个表相互关联，结果只删除了第一个表 A（task）中数据，导致 B (task_apoly)表数据依旧在，这个就不好了！由于数据量比较大，还不能直接删除B中所有数据，只能关联查询删除了

delete from task_apply where task_id IN select a.task_id from(select a.task_id from task_apply a LEFT JOIN task b on a.task_id = b.id where b.id is null)

写了一个这个关联删除本以为大工告成，结果sql不愿意

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

直接保存了，你说说你啊

然后查了资料才发现不能这样写

需要把下面查询数据再重新查询一下给 delete

select a.task_id from task_apply a LEFT JOIN task b on a.task_id = b.id where b.id is null

结果是只能这样用了

delete from  task_apply where task_id IN select a.task_id from(select a.task_id from  task_apply a LEFT JOIN task b on a.task_id = b.id where b.id is null)

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