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How do I calculate across linked tables in a view?

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    How do I calculate across linked tables in a view?

    I am new to Alpha 5. Have set up a database linked tables for customers-orders-order details-payments using strickly grids and detail grids. I want to show a view of customers who owe against orders by adding order details together from one table + Freight charge from another table and then subtract sum of payments from a 3rd linked table. I've attached a summary of the view I was trying to use but cannot get the calculations to work.

    #2
    Re: How do I calculate across linked tables in a view?

    Hi Is this a desktop app or Web app question?

    If its desktop which it looks like you would probably need to post the question in that area.
    Chad Brown

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      #3
      Re: How do I calculate across linked tables in a view?

      This is defintely a web app.

      Bob

      You'll need to post the components and code that you are using for anyone to give you any sort of help.
      Al Buchholz
      Bookwood Systems, LTD
      Weekly QReportBuilder Webinars Thursday 1 pm CST

      Occam's Razor - KISS
      Normalize till it hurts - De-normalize till it works.
      Advice offered and questions asked in the spirit of learning how to fish is better than someone giving you a fish.
      When we triage a problem it is much easier to read sample systems than to read a mind.
      "Make it as simple as possible, but not simpler."
      Albert Einstein

      http://www.iadn.com/images/media/iadn_member.png

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        #4
        Re: How do I calculate across linked tables in a view?

        I may be wrong, but I don't see or know of any way a grid linker or view helps you with cross-table calculations. That is, the expression you will ultimately use in your Customer grid is the same whether you have linked tables or not. I'm at a loss because I almost never use grid linker or views because I find them cumbersome and most often not the best way to display data to the user.

        If you need a list of customers, with one column showing balance due, then I would build my grid on just the Customers, and include a Calculated Field with an expression using DBSUM() or TABLESUM() as necessary to get your total.

        Another method would be to do this same calculation in the table Field Rules as a Calculation (e.g., not in the web environment at all). Your value would be available to the grid as a normal field with the value already set. I like this alternative better. Since you have a value already present at runtime, if you want you can Filter your grid to only show records where BalanceDue > 0.
        Steve Wood
        See my profile on IADN

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          #5
          Re: How do I calculate across linked tables in a view?

          Steve,

          I'm still learning about both grid linkers and views. If you rarely use either, what do you do instead? Does this mean you wrote code instead?

          Thank you.

          --Rob

          Comment


            #6
            Re: How do I calculate across linked tables in a view?

            Originally posted by Steve Wood View Post
            I may be wrong, but I don't see or know of any way a grid linker or view helps you with cross-table calculations. That is, the expression you will ultimately use in your Customer grid is the same whether you have linked tables or not. I'm at a loss because I almost never use grid linker or views because I find them cumbersome and most often not the best way to display data to the user.

            If you need a list of customers, with one column showing balance due, then I would build my grid on just the Customers, and include a Calculated Field with an expression using DBSUM() or TABLESUM() as necessary to get your total.

            Another method would be to do this same calculation in the table Field Rules as a Calculation (e.g., not in the web environment at all). Your value would be available to the grid as a normal field with the value already set. I like this alternative better. Since you have a value already present at runtime, if you want you can Filter your grid to only show records where BalanceDue > 0.
            Last edited by flyer296; 03-15-2009, 09:36 AM. Reason: add comments

            Comment


              #7
              Re: How do I calculate across linked tables in a view?

              I need to add a total from the orders linked table (Orders->FreightCharge) to a sum from the OrderDetails linked table (OrderDetails->LineItems) for each customer in the Customer Table linked to the order table.

              The only way I can figure to do that is through a report.

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