case statement in having clause in sql

Question

Can I have a case statement in a HAVING clause in SQL server 2005?

Below is my HAVING statement. It is giving me a syntax error.

@CLIENTPK_NEW IS NULL OR 
    (
        CLIENT.OH_PK = @CLIENTPK_NEW and 
        CASE WHEN @RelatedOrgs <> '11' then CLIENT.OH_PK= @CLIENTPK_NEW
        ELSE CLIENT.OH_PK in (
            SELECT dbo.OrgHeader.OH_PK FROM dbo.OrgHeader WITH (NOLOCK) INNER JOIN
            dbo.OrgRelatedParty WITH (NOLOCK) ON dbo.OrgHeader.OH_PK = dbo.OrgRelatedParty.PR_OH_Parent INNER JOIN
            dbo.OrgHeader AS OrgHeader_1 WITH (NOLOCK) ON dbo.OrgRelatedParty.PR_OH_RelatedParty = OrgHeader_1.OH_PK
            where OrgHeader_1.OH_PK = @CLIENTPK_NEW
        ) 
        END 
    )
}
AND (@CGNEEPK IS NULL OR CGNEE.OH_PK = @CGNEEPK) AND    
part.OP_RH_NKCommodityCode = @type 

Thanks,

Amit

Answer 1

Example (from here):

USE AdventureWorks2008R2;
GO
SELECT JobTitle, MAX(ph1.Rate)AS MaximumRate
FROM HumanResources.Employee AS e
JOIN HumanResources.EmployeePayHistory AS ph1 
    ON e.BusinessEntityID = ph1.BusinessEntityID
GROUP BY JobTitle
HAVING (MAX(CASE WHEN Gender = 'M' 
        THEN ph1.Rate 
        ELSE NULL END) > 40.00
     OR MAX(CASE WHEN Gender  = 'F' 
        THEN ph1.Rate  
        ELSE NULL END) > 42.00)
ORDER BY MaximumRate DESC;

Answer 2

Yes, that is valid syntax. However, the text, image, and ntext data types cannot be used in a HAVING clause.

Update: Your updated example does not make sense. Either CLIENT.OH_PK=@CLIENTPK_NEW or it doesn't, the rest of the statement is irrelevent, unless you use an OR. Perhaps you can explain the busingess logic?