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The problem that I’m trying to solve sound like: Estimate the quantity sales of product via the quantity sales of other product. So If I have a ...

Thank you so much Catalin. Instead of join, I'd like to use a function (such as record.select or field.select), passing to the function a parameter...

Thank you very much Mynda, your forum is really helpful. Please excuse me if I bother you, but I have to say that I can't understand why the rules ...