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Child Records with no match

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  • Child Records with no match

    I upload out of a spreadsheet to a child table within a set. Then I need to find the orphaned records who need a match in the parent tables. How do I go about doing that?

  • #2
    RE: Child Records with no match


    There are several ways to do this.

    Here's one:

    1) Unmark all the records in the child table
    2) Run an operation against the child table to mark each record if and only if the link field value is not found in the corresponding index list for the parent table. (Use the Exist() function, but negate it. i.e. .NOT. Exist(Key Value, TableFileName, Index Tagname)

    When finished the records needing attention in the parent table have been marked in the child table.

    -- tom


    • #3
      RE: Child Records with no match

      Am I running this mark operation in the set or in the child table?


      • #4
        RE: Child Records with no match

        Forget the previous one line question. I tried to run this operation but it selected all the child records so obviously I didn't set it up correctly. I guess you mean run this in the child table independent of the set.

        My statement was as shown below, where "New_Name" is the field name in the child table Nmroy1, and Well.dbf is obviously the parent table, and well_name is the corresponding index in well.dbf, and it is also the linking field in the parent. I know I set this up wrong or it wouldn't have marked all the records. The question is what did I do wrong?

        .NOT. Exist(New_Name,"Well.dbf", "Well_Name")


        • #5
          RE: Child Records with no match


          Have you looked at the subtract operation? It should put the two files together and produce a third file of orphans.
          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


          • #6
            RE: Child Records with no match

            Had not thought about that, will consider that as I have time in the next couple of days.


            • #7
              RE: Child Records with no match


              Yes. My suggestion requires you to run the ops against the table, not the set. I didn't mean to imply otherwise.

              without knowing the structure of your tables and the index tag names you used I have no clue what you did wrong. The result of your expression was that Alpha Five could find no matching records in the primary table of your set that corresponded to the value of the "New_name" field in your child table. So it marked all the records in the child table.

              For the Exist() function to work the table being searched must have a predefined index in place. This index must correspond to the field you're searching. This is explained in the xbasic reference manual.

              Here's a working example using two saved operations.

              The UnmarkVehicles operation unmarks all the records in the Vehicles table.

              The MarkOrphans operation marks each record in the Vehicles table that is orphaned, vis-a-vis the Customers table.

              Unzip the attachment to an empty folder.

              Hope this helps.

              -- tom


              • #8
                RE: Child Records with no match

                Tom, I just now am having a chance to look at your last response, and thanks for the zip file as that made all the difference in teh world when I could see an example.

                Now, having set this up, I need to figure out how to only print one representative child record that does not have a match. I could have 50 or more of the same child value, and so I wouldn't want to print all these records.