select * from (select *from b) as xxx where
select * from (select *from b) xxx where
确实是一样的,但是第三句相当于
select * from (select *from b) where
这个有错误.
select * from (select *from b) as xxx where
select * from (select *from b) xxx where
确实是一样的,但是第三句相当于
select * from (select *from b) where
这个有错误.