Adding another table

Morning all,

I several tables:

wbCostCentre = List of cost centres
wbCompany = Company details
wbAssetTrack = ties an asset (i.e. mobile) to an employee
wbAssetTrack = copy of the wbAssetTrack with start and end dates of ownership
wbMCD = Mobile information
wbMessage = Call data (in this case SMS messages)
wbCostManager = List of cost centre managers


The join as I have it now works fine, it lists each cost centre and the charges incurred in a given time period (INVNUMBER), however I now need to also introduce a history table (wbAssetHist) which is a duplicate of the original wbAssetTrack data.

So lets say that a mobile belonged to CostID 131 from 1st May 2008 - 20th May 2008, the mobile was then assigned to CostID 132 from the 21st May to current, the total invoice value was £100 and the charges between the 1st May - 20th May where £40 and the charges between 21st May to the end of invoice was £60.

Currently what happens is that the CostID 131 shows the full charges of £100 which I expect because the query uses the MobdevID, if I add D.CostID = A.CostID to the wbMessage join after INVNUMBER then it will show the £40 correctly, what I can't figure out is how to include the history table into the join, so it collects data not only based on the current AssetTrack table but also adds any history charges to the correct CostID.


The rsults I get from this example are

131      178.892      Default Cost Centre      12345
132      0.000      sale                            67890

what I would expect to see is

131      178.892      Default Cost Centre      12345
132      38.789      sale                             67890

I'm not getting the charges for the CostID 132




Hopefully this makes some sense

Many thanks

SELECT
A.CostID,
CONVERT(DECIMAL(10,3), SUM(ISNULL(D.CHARGE,0))) AS CHARGE,
COSTNAME,
COSTNUMBER
 
FROM wbCostCentre A LEFT JOIN wbCompany B ON A.CompID = B.CompID
                                             LEFT JOIN wbAssetTrack  E ON E.CostID = A.CostID
                                                   LEFT JOIN wbAssetHist  G ON G.CostID = A.CostID
                                                          LEFT JOIN wbMCD C ON C.AssID = E.AssID
                                                                 LEFT JOIN wbvoiceout D ON D.MobDevID = C.MobDevID AND INVNUMBER = '92007' AND D.COSTID = A.COSTID
                                                                        LEFT JOIN wbCostManager F ON F.CostID = A.CostID
 
 
WHERE A.COMPID= 16 AND  F.EMPID = 2102 OR A.COMPID= 16 AND  INVNUMBER IS NULL  AND F.EMPID = 2102
GROUP BY A.CostID,COSTNAME,COSTNUMBER
ORDER BY A.CostID

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