多加入子查询的SQL Server 2008

Question

在左边，你会看到我的设计为一个表，在右边你会看到下面的SQL从子查询的结果。我试图在tblClaims上的三个字段patientID,claimsFromDate,claimsThroughDate上加入子查询，并且让外部查询将正确的tblClaims.ID与三部分连接相关联。

我得到的错误：

3线，关键词附近的语法不正确选择靠近and不正确 语法），第12行

select tblClaims.id, t.primaryCode 
from t 
(
select patientid, claimsfromdate, claimsthroughDate, primarycode from myTable 
union 
select patientid, claimsfromDate, claimsthroughDate, secondaryCode from myTable 
union 
select patientID, claimsfromdate, claimsthroughDate, tertiarycode from myTable 

) as t 
inner join t on tblclaims.patientid=t.patientid 
and tblclaims.claimsfromdate=t.claimsfromdate 
and tblclaims.cllaimsthroughdate=t.claimsfromdate 

编辑：内层查询是协调一个多列字段。它返回150万行。 这是

select tblClaims.id, t.primarycode from ( select patientid, claimsfromdate, claimsthroughDate, primarycode from myTable ) as t inner join tblclaims on tblclaims.patientid=t.patientid and tblclaims.claimsfromdate=t.claimsfromdate and tblclaims.cllaimsthroughdate=t.claimsfromdate

Answer 1

固定查询我跑回来350万试试这个：

select tblClaims.id, t.primarycode 
from 
(
select patientid, claimsfromdate, claimsthroughDate, primarycode from myTable 
) as t 
inner join tblclaims on tblclaims.patientid=t.patientid 
and tblclaims.claimsfromdate=t.claimsfromdate 
and tblclaims.cllaimsthroughdate=t.claimsfromdate 

Answer 2

你尝试使用Distinct？

select DISTINCT tblClaims.id, t.primarycode 
from 
(
    select patientid, claimsfromdate, claimsthroughDate, primarycode from myTable 
) as t 
inner join tblclaims on tblclaims.patientid=t.patientid 
and tblclaims.claimsfromdate=t.claimsfromdate 
and tblclaims.cllaimsthroughdate=t.claimsfromdate