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How can I compare two month totals and show those that are 10% lower than previous month?

The attached query lists each month totals for Cntr.  I want the query to show only months that the Cntr totals were 10% lower than previous month's.
qryComparisonYTD.docx
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softsupport
Asked:
softsupport
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1 Solution
 
chaauCommented:
can you please show some sample data. It is unclear what values are in your qryClaimComparisonYTD.[ClaimDate] column for each row
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softsupportAuthor Commented:
Sample data attached.  Query lists total for each month.  I want to compare current months totals to the previous month and show if totals are 10% lower.
dataComparisonYTD.xlsx
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chaauCommented:
Thanks for the sample data. It really helped. This query will give you the desired result:
SELECT Prev.[Center_Center Id], Prev.[Center Name], 
Prev.[CenterClaim_Center Id], Prev.ClaimDate, 
Prev.CenterTotalClaimed, Curr.ClaimDate, 
Curr.CenterTotalClaimed
FROM qryMealsClaimComparisonYTD AS Prev INNER JOIN qryMealsClaimComparisonYTD AS Curr 
ON (Prev.[CenterClaim_Center Id] = Curr.[CenterClaim_Center Id]) AND (Prev.[Center_Center Id] = Curr.[Center_Center Id])
WHERE ((([Prev].[ClaimDate]+1)=DateAdd("m",-1,[Curr].[ClaimDate]+1)) AND ((Curr.CenterTotalClaimed)<=[Prev].[CenterTotalClaimed]*0.9));

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You can adjust the percentage by modifying the last parameter "[CenterTotalClaimed]*0.9". At the moment it is "*0.9" but you can make it 0.8 for 20%
This is the results of this query:
Query Result
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