[Err] 1093 - You can't specify target table 's' for update in FROM clause

[Err] 1093 - You can't specify target table 's' for update in FROM clause

执行SQL

DELETE from  book WHERE id IN(
SELECT id FROM (SELECT id,name FROM book WHERE name  IN(
SELECT  name FROM book  GROUP BY name HAVING count(name) > 1
) ) t WHERE id NOT IN (
SELECT  id FROM book  GROUP BY name HAVING count(name) > 1));

出现错误：

[Err] 1093 - You can't specify target table 's' for update in FROM clause

执行SQL语句时出现这个错误。原因是在更新这个表和数据时又查询了它，而查询的数据又做了更新的条件

解决方法：把要删除的数据查询出来做为一个第三方表，然后进行删除。

DELETE book from book ,
(SELECT id FROM (SELECT id FROM book WHERE name IN(SELECT  name FROM book  GROUP BY name HAVING count(name) > 1) ) t WHERE id NOT IN (SELECT  id FROM book  GROUP BY name HAVING count(name) > 1)
) as a
WHERE book.id = a.id;

转载于:https://www.cnblogs.com/new0801/p/6146607.html

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