请问两个值的嵌套查询怎么做？
select * from table1 where
(aa,bb) in (select aa,bb from table1 where cc= 'dd ')
如上的一个查询，但是我写的不对，请帮我纠正一下
[解决办法]
select * from table1 a where exists(select 1 from table1 where aa=a.aa and bb=a.bb and cc = 'dd ')
