rolling sum query?

joe789

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Hey Folks,

I have a table comprised of/grouped by agency, payer source and billing date summing dollars the order/display of the data is the same as the grouping; that is, ordered by agency, payer source, and billing date. The billing date is just every Tuesday of every week. Every once in a while, there is a negative value in terms of dollars for a particular agency/payer source/billing date category. When this happens, a voucher isn't created and in billings that follow that 'rolling negative' amount must be accounted for. Is there a way in which I can produce a value on the line that adds the rolling negatives from prior weeks if they exist? An example is below:

Agency Payer Source Date of Billing Dollars Amt to Release
ABC Patient 1/28/13 $500 $500 *full amt releases because no rolling negatives
ABC Patient 2/04/13 $600 $600 *full amt releases because no rolling negatives
ABC Patient 2/11/13 $-200 *nothing released because negative amt
ABC Patient 2/19/13 $300 $100 *$300 - $200 released because a negative occurred in prior week

Thank you very much for any help you can provide!

Joe
 

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