create query in sql server

I am having trouble creating an sql server query that uses a sub query.
I have a sub query :

SELECT TblWordTags.ClientCode, TblWordTags.ClientCodeWordPosition
FROM TblWordTags
GROUP BY TblWordTags.ClientCode, TblWordTags.ClientCodeWordPosition;

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The main query (ive restricted it with the where for the moment)
SELECT TblWords.ClientCodeWordPosition, TblWords.ClientCode, TblWords.Word, QrySubQuery.ClientCode, TblWords.StrFull
FROM TblWords LEFT JOIN QrySubQuery ON (TblWords.ClientCodeWordPosition = QrySubQuery.ClientCodeWordPosition) AND (TblWords.ClientCode = QrySubQuery.ClientCode)
WHERE (((TblWords.ClientCode)="A01ND"));

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Not sure how to port this over to sql server with the sub query despite reading one of the experts posts on access to sql server
PeterBaileyUkAsked:
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
the code should work as is, except the double quotes, for string values it should be single quotes.
apart from that, what are the issues?
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Vitor MontalvãoMSSQL Senior EngineerCommented:
Add the subselect code directly after the LEFT JOIN and give it an alias:
SELECT TblWords.ClientCodeWordPosition, TblWords.ClientCode, TblWords.Word, QrySubQuery.ClientCode, TblWords.StrFull
FROM TblWords 
	LEFT JOIN (SELECT ClientCode, ClientCodeWordPosition
		FROM TblWordTags
		GROUP BY ClientCode, ClientCodeWordPosition) QrySubQuery ON (TblWords.ClientCodeWordPosition = QrySubQuery.ClientCodeWordPosition AND TblWords.ClientCode = QrySubQuery.ClientCode)
WHERE TblWords.ClientCode ='A01ND'

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Btw, why do you need the GROUP BY? Do you have duplicate values?
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PeterBaileyUkAuthor Commented:
if i save the subquery then the outer query can use it or do i need to do something else?
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PeterBaileyUkAuthor Commented:
I wasnt sure sql server worked in this way, but it does so thank you
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ste5anSenior DeveloperCommented:
I would use a CTE:

WITH    QrySubQuery
          AS ( SELECT   WT.ClientCode ,
                        WT.ClientCodeWordPosition
               FROM     TblWordTags WT
               GROUP BY WT.ClientCode ,
                        WT.ClientCodeWordPosition
             )
    SELECT  W.ClientCodeWordPosition ,
            W.ClientCode ,
            W.Word ,
            Q.ClientCode ,
            W.StrFull
    FROM    TblWords W
            LEFT JOIN QrySubQuery Q ON ( W.ClientCodeWordPosition = Q.ClientCodeWordPosition
                                         AND W.ClientCode = Q.ClientCode
                                       )
    WHERE   W.ClientCode = 'A01ND';

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