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Subtracting debits from credits when they are all positive numbers and credit/debit is indicated in

Posted By:      Posted Date: September 02, 2010    Points: 0   Category :Sql Server
Hi,   I have a table with four columns - InvoiceCreditLineID, SOPOrderReturnLineID, InvoiceCreditQuantity, SOPInvoiceCreditType. The third contains only positive numbers. The fourth contains a 1 for credits and a 2 for debits.   I need to show summed credit quantities minus the summed debit quantities, grouped by SOPOrderReturnLineID. I tried using a sum in a subselect in the select clause for the credit quantities and another for the debit quantities, but this just shows me the totals for the whole table.   Any idea how I do this?

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