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

From the error you mentioned in the comments:

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

Use of aggregate functions require you to group by the columns that appear in the SELECT list other than the aggregated columns.

Edit:

I think this is what you are looking for:

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

Answer 2

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