删除：您无法指定目标表＆＃39; table_name＆＃39;用于FROM子句中的更新

Question

我正在使用以下查询来删除不在另一个表中的数据。

delete from table_1 where tbl_id in  
(select tbl_id from table_1 left join table_2
on table_1.tbl_id=table_2.another_tbl_id where table_2.another_tbl_id is null)

以上查询中是否有任何问题？

它显示您无法在FROM子句中为更新指定目标表'table_1'。

如何解决这个问题？

Answer 1

试试这个，

DELETE t1 FROM tablename1 t1 LEFT JOIN tablename2 tn2
ON t1.tbl_id=tn2.an`enter code here`other_tbl_id WHERE tn2.another_tbl_id IS NULL

Answer 2

您必须使用JOIN而不是IN

DELETE table_1.* FROM table_1
LEFT JOIN table_2 ON table_1.tbl_id=table_2.another_tbl_id
WHERE table_2.another_tbl_id IS NULL

Answer 3

解决了我的问题。

我修改了上面的查询如下：

delete from table_1 where tbl_id not in  
(select another_tbl_id from table_2)

感谢您的所有回复......

Answer 4

最简单的方法就在这里......

        DELETE t1 FROM table_1 t1 WHERE t1.tbl_id NOT IN  
         (SELECT another_tbl_id FROM  table_2)