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Help with query

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  • Help with query

    I am trying to get a fairly simple query to work...
    but I am getting an error
    ERROR: No such field

    below is copied from an interactive session:
    =====================================================================================
    tbl = Table.open("consultants")

    query.description = "Select4HeadOfChain"

    query_order = "Primekey"

    query_filter = "Num1upline = CDN-000019"

    ui_msg_box("QueryFilter = " + query_filter, "QueryFilter = " + query_filter,UI_ATTENTION_SYMBOL+UI_OK)

    ?tbl.num1upline
    = "CDN-000000"

    query_flags = ""

    tbl.query_create(query_flags, query_filter, query_order)
    ERROR: No such field
    ?tbl.NUM1UPLINE
    = "CDN-000000"


    ?tbl.PRIMEKEY
    = "CDN-000005"
    ======================================================================

    The query is simple: query_filter = "Num1upline = CDN-000019"
    The field 'Num1upline' definitely exists as demonstrated by the two lines below...
    ?tbl.NUM1UPLINE
    = "CDN-000000"

    Primekey (ordered on this key) also exists
    ?tbl.PRIMEKEY
    = "CDN-000005"

    Why am I getting the
    ERROR: No such field
    response???

  • #2
    Re: Help with query

    query_filter = "Num1upline = 'CDN-000019' "
    or
    query_filter = "Num1upline = \"CDN-000019\" "
    or
    query_filter = "Num1upline = "+quote("CDN-000019")
    There can be only one.

    Comment


    • #3
      Re: Help with query

      Thanks Stan...

      Comment


      • #4
        Re: Help with query

        Just FYI. The error was that the field CDN-000019 did not exist.

        Alpha interpreted the query_filter = "Num1upline = CDN-000019"
        as, filter for records where the value in Num1upline matches the value in CDN-000019.
        There can be only one.

        Comment


        • #5
          Re: Help with query

          Yes... that became clear after I looked closely at your suggestions...
          I've been working with Alpha for MANY years... building these queries is one of the few concepts that I have trouble with... particularly if I haven't been using them for a while...
          I'm hoping that you will be around until I really retire, to bail me out!
          Thanks again!

          Comment


          • #6
            Re: Help with query

            Best advice one can follow is to open the default browse for the table. Use query by expression to create a working query. Copy that query to a script.

            Now put quotes around it. Then make the necessary adjustments to handle any "inner" quotes that were present in the original filter.

            Num1upline = "CDN-000019" would work in a query by expression.
            Quoted in a script it would be "Num1upline = "CDN-000019""
            Now, how to handle the inner quotes?

            I should add that when referencing variables in a query and then quoting such a query, the variables become "hidden" in the sense that Alpha doesn't distinguish the variable's name as being anything but plain text. After quoting, in this case, one must "expose" the variables to the outer context.
            Last edited by Stan Mathews; 06-24-2015, 01:33 PM.
            There can be only one.

            Comment


            • #7
              Re: Help with query

              Since this is about queries, when do you use brackets around a variable in a filter expression? I've seen it used in a between() function, and was wondering why.
              Robin

              Discernment is not needed in things that differ, but in those things that appear to be the same. - Miles Sanford

              Comment


              • #8
                Re: Help with query

                See the documentation for REPLACE_PARAMETERS().
                There can be only one.

                Comment

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