多加入子查詢的SQL Server 2008

Question

在左邊，你會看到我的設計爲一個表，在右邊你會看到下面的SQL從子查詢的結果。我試圖在tblClaims上的三個字段patientID,claimsFromDate,claimsThroughDate上加入子查詢，並且讓外部查詢將正確的tblClaims.ID與三部分連接相關聯。

我得到的錯誤：

3線，關鍵詞附近的語法不正確選擇靠近and不正確 語法），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 

編輯：內層查詢是協調一個多列字段。它返回150萬行。 這是

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

固定查詢我跑回來350萬試試這個：

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

你嘗試使用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