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Specifying unique records

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    #1

    Specifying unique records

    How do you specify that a filter only include unique records. I want to create a new database that only includes unique records for a given field. How do you specify that as a filter expression?
    Richard Urban
    Richard Urban

    Grocery Delivery Software for Stores and Entrepreneurs: http://www.urbangrocery.com
    Tags: None
    #2
    RE: Specifying unique records

    Richard,

    The validation field rule would a good place to start.

    I think it will work well, especially in a single user, stand alone, environment. If you're designing for a multi-user networked setting you may want to search this forum for related threads cause some folks have had difficulties. Search for threads that contain the word validation or the word unique or the word duplidate.

    If you don't use the field rule, you can build your own custom validation routines into form level events on your data entry form.

    -- tom

    Comment

      #3
      RE: Specifying unique records

      More specifically, when copying to a new database, I only want unique records for the "Category" field. I want to specify this in the filter that is part of the "Copy" process, but I do not know how to write this as an expression. Is there a function to specify unique records for a certain field, such as unique("category") or the like?
      Richard Urban
      Richard Urban

      Grocery Delivery Software for Stores and Entrepreneurs: http://www.urbangrocery.com

      Comment

        #4
        RE: Specifying unique records

        Richard,

        Those are very different questions. My initial response won't be of much help.

        This highlights one of the limitations of the message board format. Often it takes a string of posts, questions, and posts to get down to a description of the actual problem.

        Richard, I'm not picking on you. It takes a while to get a feel for 'how much' is 'enough', when trying to decide what level of detail to include. I find it helpful when framing a question for a new topic to try to answer these questions, assuming the reader must answer them blindfolded:

        1) what, exactly, am I trying to do?

        2) where, exactly, am I trying to do it? (field rules, form layout, report layout, saved operation, user defined function, etc)

        3) when, exactly, do I want it to happen? (on button push, when saving, before saving, etc.)

        4) what, exactly, have I tried to do on my own (search for other useful topics, attempt script, etc) ?

        5) what, exactly, was the result?

        -- tom

        Comment

          #5
          RE: Specifying unique records

          Richard,

          I don't recall a function that you could use to limit the range of records you want to copy to the new database. Perhaps others will have some ideas along that line.

          In the meantime, here are two ideas for you:

          1) Create the other table by duplicating the structure of the existing table.

          2) Write a short script to open the existing table; set an index which specifies unique values; step through the table one record at a time, entering values of the existing table into new records in the new table.


          or

          3) Duplicate the table AND its data to the new table; define a unique index there; activate the unique index so your browse display shows only unique categories. Mark all the displayed records. Switch to a different index, showing all the records in the table. Delete all the Unmarked records. This will leave you with only unique categories.


          -- tom

          Comment

            #6
            RE: Specifying unique records

            Hi Tom,
            Thanks for the advice. I used your number 3 advice, and that worked fine. I specified .not.marked() on the unmark/mark/delete card to delete the duplicate records.
            Richard Urban
            Richard Urban

            Grocery Delivery Software for Stores and Entrepreneurs: http://www.urbangrocery.com

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