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Hi I'm designing a query. It's very simple. I just need to compute something like: Var: TT[YYZ for this month]-TT[YYZ for last month] The table is called C1 and has the fields i'm interested YYZ: Location TT: number mxx: date So, i have for YYZ a list of places and for TT a list of values...

Hi I'm lost. That's the beginning. I need to compute the increase for the field Area the following: yyz(t)-yyz(t-12). T es month. The table has this structure Area yyz date Y Area represents different locations. Each area has only one record per month. Month is obviously the field...

Hi I'm new. I hope to learn a lot using this forum. Thanks.