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unique append

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  • unique append

    Hi Phorum,

    Does unique only and unique, replace existing in an append operation
    really work? I have tried this so many times, looking for a mistake I might have made, yet when I try to append an existing table of the same name and
    structure that has all of the same records plus a few more (it's the
    few more that I am after), it appends every record and I wind up with
    duplicate records. I don't see any difference between all, unique
    only or unique, replace existing, when I run the operation.

    thank you,
    efs

  • #2
    RE: unique append

    Unique and Unique,replace work for me.

    Your obstacle might be the linking key. This determines what a unique record is.
    There can be only one.

    Comment


    • #3
      RE: unique append

      Sounds a bit familiar. The answer was in the query.order, which need to be an existing index. Actually I recall that it needed to be the primary index, but that isn't what my scripts show.

      Comment


      • #4
        RE: unique append

        As Stan pointed out, you have to define what makes a record unique by defining the linking key. You can use just one field, or several (i.e., JOB_NO+CUST_NO).

        A word of warning: If the master table (the one to which you are appending) does not contain a record with a certain value (i.e., "101") in a field, and the transaction table (the one to be appended to the master) has more than one record with that value, ALL records with "101" will append to the master. This is a glitch in the append operation, and Alpha is aware of it.

        Comment


        • #5
          RE: unique append

          7ZNJABB,

          I do this all the time with no problems. The advice here is good -- make sure that your respective keys truly correspond.

          By the bye, I almost never use indexes since Alpha can create them on the fly for most data operations; so that hasn't affected the outcome for me one way or the other.

          Silly question, I know, but you have entered expressions for both the Master and Transaction tables, right?

          Oh, and one other thing... What is your name????????????

          Best regards,

          UJ687KK41LD

          Comment


          • #6
            RE: unique append

            Hi Stan,

            The table in question only has 3 fields and I use all 3 to link. BTW,
            I have 7 different appends in this app for 7 different tables, all are
            set to "unique only", the other 6 work properly.
            Thank you,
            efs

            Comment


            • #7
              RE: unique append

              Hi UJ,

              I am not using an expression on either table, only an index using all
              3 fields, the only filtering I need is "unique only" and as I reported
              earlier, there are 6 other appends in the app, all made the same way
              only using different tables. The other 3 work ok.

              Thank you,
              efs

              BTW, my name is Edward F. Schulz, but I will answer to Ed. (7 on
              occasion)

              Comment


              • #8
                RE: unique append

                Hi Phorum,

                This is a follow-up on this peculiar problem. The goal here is to
                receive an attachment by email that supposedly has additionl records
                entered at a different office and append it to the receiving office
                table. In the beginning, using "unique only", it would append all
                records which resulted in many duplications of records.

                I examined the table in both the native table as well as the email
                table closely for differences, field name, char length, character
                type, spelling, you name it. They were identical. The next step, I
                copied the email attachment table over top of the application table and
                it solved the problem. Keep in mind that I am by no means an A5
                proficionado, but I would like to know a reasonable explanation of why
                this solution was successful, moreover, I am worried that it can
                reoccur.

                Attached is a copy of the append operation, bear in mind, I did not
                make any changes from the original that did not work.

                Thank you for reading,
                efs AKA 7

                Comment

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