sql server in 子查询

cxin

期望是这种查询  
select * From Empoylee Where
(Address1,Address2) in
(Select Address1,Address2
From EmpoyleeAdresses
Where Country = 'Canada') 这种查不出来 你可以以下方法
1 exists 方法
select a.* From Empoylee a
Where exists
    (select 'A' from EmpoyleeAdresses b
     Where
        b.Country = 'Canada'
            and a.Address1=b.Address1
            and a.Address2=b.Address2
        )
2 用内连接
select *
From
Empoylee
inner join EmpoyleeAdresses
on
Empoylee.Address1=EmpoyleeAdresses.Address1
and
Empoylee.Address2=EmpoyleeAdresses.Address2
Where
EmpoyleeAdresses.Country = 'Canada')


select *
from
Empoylee em
inner join EmpoyleeAdresses emA
on
em.Address1=emA.Address1
and
em.Address2=emA.Address2
and
emA.Country = 'Canada'

3 表关联

select a.*
From
Empoylee a ,
  (Select
  Address1,Address2 From EmpoyleeAdresses
  Where
  Country = 'Canada') b
Where
a.Address1=b.Address1
and
a.Address2 = b.Address2