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到目前为止，MySQL 还不能支持这样的操作，子查询的 FROM 字句和更新/删除对象不能使用同一张表。

mysql> DELETE FROM tab1 WHERE col1 = ( SELECT MAX( col1 ) FROM tab1 );ERROR 1093 (HY000): You can't specify target table 'tab1' for update in FROM clause

针对“同一张表”这个限制，撇开效率不谈，多数情况下都可以通过临时表来变通解决，像这样

DELETE FROM tab1WHERE col1 = (  SELECT MAX( col1 )  FROM (    SELECT * FROM tab1  ) AS t);