Msg 147 An aggregate may not appear in the WHERE clause unless it is in a subquery contained in a HAVING clause or a select list

Question

I am running SSMS 2008

select 
    A.JOBNUMBR as [Service Call], A.PONUMBER as [PO Number], 
    sum(A.QTYUNCMTBASE*A.UNITCOST) as [Committed Cost PO], 
    SUM(B.WS_Committed_Cost) as [Committed Cost WS], 
    (sum(A.QTYUNCMTBASE*A.UNITCOST)-SUM(B.WS_Committed_Cost)) as [Variance]
from 
    POP10110 A
LEFT JOIN 
    SV_Costs B on A.JOBNUMBR = B.Service_Call_ID and A.PONUMBER = B.Reference_TRX_Number and B.WS_Committed_Cost <> 0
where 
    A.Product_Indicator = 3
    and A.QTYUNCMTBASE <> 0
    and (sum(A.QTYUNCMTBASE * A.UNITCOST) - SUM(B.WS_Committed_Cost)) <> 0
group by 
    A.JOBNUMBR, A.PONUMBER
order by 
    A.JOBNUMBR, A.PONUMBER

I get the error MSG 147 in the subject line when I run this query. The 3rd where clause is the same as the aggregated column [Variance] which I am trying to filter down to <> 0. The query runs without this 3rd where clause.

I have been doing a bit of reading and understand that I need to include HAVING or a select statement in the where clause but I can't quite get the syntax right, any help would be appreciated.

Thank you

Tania

Answer 1

Sum is an aggregated column, invalid for use in your selection (WHERE clause). One solution is to wrap this on another SELECT. OR:

SELECT
          A.JOBNUMBR as [Service Call], 
          A.PONUMBER as [PO Number], 
          SUM(A.QTYUNCMTBASE*A.UNITCOST) as [Committed Cost PO], 
          SUM(B.WS_Committed_Cost) as [Committed Cost WS], 
          SUM(A.QTYUNCMTBASE*A.UNITCOST) - SUM(B.WS_Committed_Cost) as [Variance]
FROM      POP10110 A
LEFT JOIN SV_Costs B 
       ON A.JOBNUMBR = B.Service_Call_ID 
          AND A.PONUMBER = B.Reference_TRX_Number 
          AND B.WS_Committed_Cost <> 0
WHERE     A.Product_Indicator = 3
      AND A.QTYUNCMTBASE <> 0
GROUP BY  A.JOBNUMBR, A.PONUMBER 
   HAVING (SUM(A.QTYUNCMTBASE * A.UNITCOST) - SUM(B.WS_Committed_Cost)) <> 0
ORDER BY  A.JOBNUMBR, A.PONUMBER