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Query on field unique

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  • Query on field unique

    I want to query a table based upon only displaying records where the PartNum field is unique.





    tbl = table.open("Parts")
    query.description = ""
    query.order = ""
    query.filter = ""
    query.options = "U"
    Q = tbl.query_create()
    Peter
    AlphaBase Solutions, LLC

    [email protected]
    https://www.alphabasesolutions.com



  • #2
    Re: Query on field unique

    Query.order = "partnum"
    Query.filter ="unique_key_value()"
    There can be only one.

    Comment


    • #3
      Re: Query on field unique

      Stan, you beat me.

      From the help...

      UNIQUE_KEY_VALUE()

      Syntax

      Logical Result_Flag = UNIQUE_KEY_VALUE()

      Description

      The UNIQUE_KEY_VALUE() function is a special function that returns .T. (TRUE). Its sole purpose is for use in a filter expression where you want to return only those records with unique key values that satisfy the filter expression.

      Note : Using the UNIQUE_KEY_VALUE() function in a query filter is equivalent to selecting "U" for the query.options flag when using the <TBL>.QUERY_CREATE()method. The advantage of this function over setting the appropriate flag in query.options is that many Alpha Five methods and functions prompt for a filter, but do not let you specify query options.

      Supported By

      Alpha Five Version 5 and Above

      Example

      This will produce a report showing all type 'A' customers sorted by state:

      report.preview("customer", "type = 'A' ", "state")


      This will produce a report showing the first type 'A' customer in each state:

      report.preview("customer", "type = 'A' .and. unique_key_value() ", "state")
      Alpha 5 Version 11
      AA Build 2999, Build 4269, Current Build
      DBF's and MySql
      Desktop, Web on the Desktop and WEB

      Ron Anusiewicz

      Comment


      • #4
        Re: Query on field unique

        Originally posted by Stan Mathews View Post
        Query.order = "partnum"
        Query.filter ="unique_key_value()"
        Sorry. I forgot to mention the main point. I need the values to be in record number order, not partnum order.
        Peter
        AlphaBase Solutions, LLC

        [email protected]
        https://www.alphabasesolutions.com


        Comment


        • #5
          Re: Query on field unique

          I ended up writing the data to a 2nd table after applying the unique. I also appended the recno() from the original table to a record_num field in the 2nd table which allows me to preserve the original data entry order.
          Peter
          AlphaBase Solutions, LLC

          [email protected]
          https://www.alphabasesolutions.com


          Comment


          • #6
            Re: Query on field unique

            or....

            http://wiki.alphasoftware.com/TBL.MA...ght=MARK_DUPS2

            Then choose the unmarked rows.
            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

            Comment


            • #7
              Re: Query on field unique

              Good one, Al!
              Peter
              AlphaBase Solutions, LLC

              [email protected]
              https://www.alphabasesolutions.com


              Comment

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