Contact ID Today Date Tonnage for the Week
bu1234 05/01/2002 100
bu1234 04/02/2002 120
bu1234 02/03/2002 150
the Contact ID Today Date Tonnage for the Week is enter in throught a form.
What i need is 100 -120 = 20 and put in to a report...
i have a report that outputs a contractID date and a number that was enter through a form.
i need to calculate table row - prevous the row in the same table for the same contract, and out put it to a report.
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