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

1、执行sql语句报上面的错误：

 DELETE
 FROM
     db_student
 WHERE
     RowGuid IN ( SELECT RowGuid FROM db_student WHERE age =  GROUP BY RowGuid HAVING count( * ) >  )
     AND ID NOT IN ( SELECT MAX( ID ) AS id FROM db_student WHERE age =  GROUP BY RowGuid HAVING count( * ) >  )

报错如下所示
You can't specify target table 'xxx' for update in FROM clause。

原因：因为在MYSQL里，不能先select一个表的记录，在按此条件进行更新和删除同一个表的记录。

详细参考：https://blog.csdn.net/h996666/article/details/81699255

 SELECT *
 FROM
     db_student
 WHERE
     RowGuid IN (
 SELECT
     aa.RowGuid
 FROM
     ( SELECT RowGuid FROM db_student WHERE age =  GROUP BY RowGuid HAVING count( * ) >  ) aa
     )
     AND ID NOT IN (
 SELECT
     t.id
 FROM
     ( SELECT MAX( ID ) as id FROM db_student WHERE age =  GROUP BY RowGuid HAVING count( * ) >  ) t
     )

 DELETE
 FROM
     db_student
 WHERE
     RowGuid IN (
 SELECT
     aa.RowGuid
 FROM
     ( SELECT RowGuid FROM db_student WHERE age =  GROUP BY RowGuid HAVING count( * ) >  ) aa
     )
     AND ID NOT IN (
 SELECT
     t.id
 FROM
     ( SELECT MAX( ID ) as id FROM db_student WHERE age =  GROUP BY RowGuid HAVING count( * ) >  ) t
     )

待续......