You can't specify target table <XX> for update in FROM clause
2017-05-05 17:32
435 查看
去重操作中，报错大意是不能先select一张表再update它。
delete from temp
where openid not in
(select openid from
(
select openid
from temp
group by openid
having count(cardid)=1
)T2
)
这样子做相当于用了一个中间表的查询，应该比起新建一个表再导回来的做法是不知道高到哪里去了
如果把T2去掉，会报错Every derived table must have its own alias，大意派生表必须有自己的表名
delete from temp
where openid not in
(select openid from
(
select openid
from temp
group by openid
having count(cardid)=1
)T2
)
这样子做相当于用了一个中间表的查询，应该比起新建一个表再导回来的做法是不知道高到哪里去了
如果把T2去掉，会报错Every derived table must have its own alias，大意派生表必须有自己的表名
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