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Need help with Adding...

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  • Need help with Adding...

    I started a subproject for a summer camp and here is the problem I am facing... Any help would be great.

    My Data Structure is following:

    Main table
    Record_ID Name Total_Store_account
    9001 Andrew (numeric field)
    9002 Tom (numeric Field)

    Account (One to many - set to Main Table linked with Record_ID)
    Record_ID Name Store_account
    9001 Andrew 9
    9001 Andrew 10
    9002 Tom 6
    9001 Andrew 9
    9002 Tom 10
    so on....

    So now I want a function that will add the data from Account table Store_Account and put it in Main table Total_Store_Account. I tried to use tabelsum, dbsum and total it does not work. As far as I know I cannot use total() in the field rule. Note that: since the data in Account table is not fixed I would like to have some function that will automatically add the data based on Record Id.

    Thanks for the help.

  • #2
    Re: Need help with Adding...

    Calculated fields don't actually update when records included in the expression are updated. They update only when the parent record is modified, and the record saved. If you update a record from the web, any calculated field will recalculate their value. So tablesum, etc will work with that in mind.

    Strictly speaking in terms of normalization, you would never include a field in the parent, that was a summation of values in child records. You would express this value in a report as a "report-level" calculated field where the summation values were generated when the report was run. It's really a problem, for instance:

    - if you had a calculated field in your parent using tablesum(), and the values in the child records changed, NONE of the parent records would reflect those changes UNTIL the parent records were individually altered (made dirty) and saved. And if you ran a report based on the parent table that included that calculated field, even the report would NOT show the updated values for those calculated fields.
    Steve Wood
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    • #3
      Re: Need help with Adding...

      Well there are ways to approach this. Basically if you are going to add records to the child table, each time a record is added you would run a posting operation to add the new value to the parent table. So if record 9002 Tom added 10 again, the 10 would be added to 9002 Tom (in the parent via a Posting Operation) and Tom's new total would then be 26.

      Dan Blank builds Databases
      Skype: danblank


      • #4
        Re: Need help with Adding...

        You have the same question in the desktop forum....please indicate what area of Alpha you are dealing with as the answers may not be the same and it can/does get confusing for us when trying to help when there are duplicate threads.

        Other thread....
        It is only when we forget all our learning that we begin to know.
        It's not what you look at that matters, it's what you see.
        Henry David Thoreau


        • #5
          Re: Need help with Adding...