Question

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Referencing field values between queries

I have 3 similar queries that when run give me the same error

You tried to execute a query that does not include the specified expression 'CompanyName' as part of an aggregate function

I kind of understand the issue but i dont know how to resolve it.. Here are 1 of the 3 queries..

    SELECT qb1.CompanyName, qb1.AssetName, qb1.Year, 
    (qb2.MPPOil-SUM(IIf(qb1.DatapointID=2003,
qb1.DatapointValue*1000000,
qb1.DatapointValue))) AS UnallocatedLossesOIL

    FROM PEBaseQuery AS qb1 
    INNER JOIN PE_MPPOilRevised AS qb2 
    ON qb1.AssetName = qb2.AssetName
    WHERE qb1.DatapointID In (2032,2034,2042,2036,2030,2028);

This is based on the calculation:

Unallocated losses = MPP – (GAS × 1000000) – (Wellwork + Annual shutdown maintenance + Export + Plant + Reservoir losses)

I used similar syntax in another table which runs smoothly :S Heres the code:

SELECT qb1.CompanyName, qb1.AssetName, qb1.Year, (qb1.DatapointValue/qb2.DatapointValue)*1000000 AS TRIPerMillionManHours
FROM HSEBaseQuery AS qb1 
INNER JOIN HSEBaseQuery AS qb2 
ON qb1.Assetname=qb2.AssetName
WHERE qb2.DatapointID=310005 AND qb1.DatapointID<>qb2.DatapointID;

Why does one work and the other doesnt?? Please help!

Answer 1

The first query contains an aggregate function, and anything not part of the calculated value which is being summed must be contained within a group by clause:

SELECT qb1.CompanyName
       , qb1.AssetName
       , qb1.Year
       , (qb2.MPPOil - SUM( IIf( qb1.DatapointID=2003,
                                 qb1.DatapointValue*1000000,
                                 qb1.DatapointValue))) AS UnallocatedLossesOIL
FROM  PEBaseQuery AS qb1 
      INNER JOIN PE_MPPOilRevised AS qb2 ON qb1.AssetName = qb2.AssetName
WHERE qb1.DatapointID In (2032,2034,2042,2036,2030,2028)
GROUP BY qb1.CompanyName
         , qb1.AssetName
         , qb1.Year
         , qb2.MPPOil;

As HansUp said, the second query doesn’t contain the aggregate function sum(), so no group by is required.