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Calculating Nett values betwen records

Question asked by HermanKloppers on Sep 30, 2010
Latest reply on Oct 3, 2010 by HermanKloppers


Calculating Nett values betwen records


Each record consists of a month text field, (10 * labels) for the house nr's and 10* text fields for the electricty usuage to be inserted. Against each apartment/house number the accumulative electricity reading for the specific month is entered -  the following month, the new accumulative readings (identical apartments) is entered via a new record – I require the program to deduct the previous reading from the Current reading to determine the Nett usage for the particular month

Is this possible ?