Referencing field values between queries

Question

Im trying to create a calculation in Access through the use of queries. At the moment one query calculates the value of \'MPP Oil\' (max production potential) and another query

Answer 1

When you create an aggregate query, every selected field must either be aggregated or grouped by.

Try:

SELECT 
    qb1.CompanyName, 
    qb1.AssetName, 
    qb1.Year, 
    (qb3.MPPOilRevised 
     - SUM(qb1.DatapointValue) 
     - SUM(qb2.DatapointValue * 1000000)) AS Result
FROM 
    PEBaseQuery AS qb1 
    INNER JOIN PEBaseQuery AS qb2 
    ON qb1.Year = qb2.Year AND qb1.Assetname=qb2.AssetName
    INNER JOIN PE_MPPOilRevised AS qb3 
    ON qb1.Year = qb3.Year AND qb1.Assetname=qb3.AssetName
WHERE 
    qb1.DatapointID in (2033, 2035, 2043, 2037, 2031) 
AND qb2.DatapointID=2003;
GROUP BY
    qb1.CompanyName, 
    qb1.AssetName, 
    qb1.Year