Hi, Let's assume I have a table (generated from DB) with 3 columns with daily receipts from three shops. Fourth column is a sum of all three values (sum is calculated by SQL query). Now, I would like to add next column showing the difference between the sum of current day, and the value from previous day. I tried using tal:define in various ways, but I either get the message that some variable is redefined twice, or some variable definition is missing. From my tests it seems that I cannot accomplish this task with tal:define. If I could do something like tal:php :-) it would be perfect. The whole idea is rather simple, but I don't know how to store previous value from one row iteration to another. Any ideas?
Rgrds, Krzysztof
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