sql delete 嵌套 select查询 You can’t specify target table ‘student’ for update in FROM clause
#删除 除了 sid相同其它均相同,并且保存sid最大的元祖
DELETE s FROM student AS s WHERE
s.`sid`<>
(SELECT MAX(ss.sid) sid FROM student AS ss
WHERE ss.`sname`=s.sname AND ss.`gender`=s.gender
AND ss.`class_id`=s.class_id )
内层嵌套的select子查询中,用到了外层delete查询的student表别名s,便会报此错误。
修改:
delete from student where sid not in (select a.sid from (select Min(sid) sid from student group by sname,
gender,
class_id) as a )