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Access 07 - Cumul Sum field in a Query - Time to process concern

Posted on 2014-02-16
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Last Modified: 2014-02-16
Hello all,

Well I've posted questions in the past trying to get a query to add a cumulative sum field within a query.

Cap1 always can do this in 1 query.... It takes me 3 queries to get to the same result but at least I was able to FINALLY get there.

I'm attaching a db only has 4 tables and the 3 queries.  The 4 tables have maybe 50 total records.

The ultimate result that I need is what is in qry_CumulSum_step3 but to get there I had to do qry_CumulSum first then qry_CumulSum_step2.

My concern here is when I open qry_CumulSum_step3 it takes too long for there only being 31 records.

So.... what will happen when I have 5,000 or 10,000 records...........

Any suggestions to speed this process up would be appreciated.

My code for the step3 query is
SELECT qry_CumulSum_Step2.ShiftID, qry_CumulSum_Step2.BusDay, qry_CumulSum_Step2.CashFdActID, qry_CumulSum_Step2.TransAmtTtl, Val(DSum("TransAmtTtl","qry_CumulSum_Step2","ShiftID <=" & [a].[ShiftID])) AS y
FROM qry_CumulSum_Step2 INNER JOIN qry_CumulSum_Step2 AS a ON (qry_CumulSum_Step2.BusDay = a.BusDay) AND (qry_CumulSum_Step2.ShiftID = a.ShiftID);

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EE-Cumulative-Sum-Q.accdb
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Question by:wlwebb
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als315 earned 2000 total points
ID: 39862437
You can increase calculation speed if you remove dsum from first query. I don't understand why you need it there. Dsum always take a lot of time, try to use it only in last step
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Author Closing Comment

by:wlwebb
ID: 39862443
It was where I started.......  I just tried to get it to do a cumulative sum on anything... I was grasping at straws at that point ;-((   I should have removed it I agree...  

When I did your suggestion it did in fact increase query step 3....

Thank you Als!!!
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LVL 40

Expert Comment

by:als315
ID: 39862520
Look at this sample with 2 queries also
EE-Cumulative-Sum-Q1.accdb
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