TSQL中實現ORACLE的多列IN 多列匹配。

期望效果：（我是拿到一對關系去另一表中的一對關系去對比）

select * From Empoylee Where
(Address1,Address2) in
(Select Address1,Address2
From EmpoyleeAdresses
Where Country = 'Canada')以上無法實現


用這種方案也可以實現 不過速度很慢的

select * from 
              (select (zcbm ||','||fwbm) as t from T_FWZC ) tt where t not in

(select (zcbm ||','||fwbm) as c from T_ZC_FC_GX)

解決方案1：用exists判斷

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
        )

解決方案2：用inner join內鏈接

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'


解決方案3：表關聯

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



主觀感覺方案1更快一些，客觀上，還沒在查詢分析器里用"顯示執行計划"看哪種寫法效率高些. 

如果是Delete語句，寫法如下：

Delete From Empoylee 
Where exists
    (select 'A' from EmpoyleeAdresses b
     Where
        b.Country = 'Canada'
            and Empoylee.Address1=b.Address1
            and Empoylee.Address2=b.Address2
        )
注意Delete from 后的表不能用別名～