- select 1 from b where b.id = a.id和 select 1 from a where b.id = a.id有区别么？select 1 from b where b.id = a.
阅读背景：
select 1 from b where b.id = a.id和 select 1 from a where b.id = a.id有区别么？
来源：互联网
分享到：
