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Retrieving data from a table

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  • Retrieving data from a table

    I want to fill in a calculated field in one record using the value of a field in another record. How do I access a particular field in a particular record from within a function call? Thanks for any help as I have been unable to figure out how to do this.

  • #2
    Re: Retrieving data from a table

    How is the particular record related to the target record?
    There can be only one.

    Comment


    • #3
      Re: Retrieving data from a table

      If I understand what you mean by "related", each record is in the same table, one above the other.

      Comment


      • #4
        Re: Retrieving data from a table

        Then what you mean is you want some value in the previous record applied to the current record.

        See the Previous() function.

        Also see http://wiki.alphasoftware.com/Default+Values
        There can be only one.

        Comment


        • #5
          Re: Retrieving data from a table

          I probably didn't pose the question with as much accuracy as I might have, so I will try again in the words of my partner Aaron. He wrote to me:
          I was afraid he would say that because we only asked for how to get data form the previous record as opposed to getting data from any other record.
          We might try asking how to make a function that compares my weight this year with my weight 10 years ago. So, the table I am working with has one record
          for each year for past 50 years and each record has a field, WEIGHT, that has my weight for that year. It has a calculated field, WEIGHT_CHANGE, that I want
          to be filled in by WEIGHT[y] - WEIGHT[y-10]when y is greater than 10. When y is 10 or less, WEIGHT_CHANGE[y] is 0. Going a step further, I would like to
          have a function weight_change(d) that give WEIGHT[y] - WEIGHT[y-d]. This might be done by treating the table as an array of by using their table functions
          like FETCH to retrieve values in other records directly.

          I hope this description is able to clear up what we are trying to do. Again, thanks for any help.

          Comment


          • #6
            Re: Retrieving data from a table

            Originally posted by foxxrunning View Post
            I probably didn't pose the question with as much accuracy as I might have, so I will try again in the words of my partner Aaron. He wrote to me:
            I was afraid he would say that because we only asked for how to get data form the previous record as opposed to getting data from any other record.
            We might try asking how to make a function that compares my weight this year with my weight 10 years ago. So, the table I am working with has one record
            for each year for past 50 years and each record has a field, WEIGHT, that has my weight for that year. It has a calculated field, WEIGHT_CHANGE, that I want
            to be filled in by WEIGHT[y] - WEIGHT[y-10]when y is greater than 10. When y is 10 or less, WEIGHT_CHANGE[y] is 0. Going a step further, I would like to
            have a function weight_change(d) that give WEIGHT[y] - WEIGHT[y-d]. This might be done by treating the table as an array of by using their table functions
            like FETCH to retrieve values in other records directly.

            I hope this description is able to clear up what we are trying to do. Again, thanks for any help.
            In pseudo code
            1. Define an index based on the person and year
            2. read the first record using a fetch_find based on the person and the starting year
            3. store the values needed in variables (weight)
            4. calculate the next value to look at in a variable - person and year-day passed into the function as an argument
            5. read that record using fetch_find with the variable from step 4
            6. calculate with the variables from step 2 and the values you just read in step 4
            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: Retrieving data from a table

              Al Thank you for your help. We will try this when next we get together.

              Comment


              • #8
                Re: Retrieving data from a table

                David,
                I thought this a fun exercise so I worked up an example for you using a little different strategy than Al's. I didn't understand what the "d" represented when you wrote WEIGHT[y] - WEIGHT[y-d] so it's likely I didn't address that. There is a small explanation on the opening form of the example.
                Attached Files
                Mike W
                __________________________
                "I rebel in at least small things to express to the world that I have not completely surrendered"

                Comment


                • #9
                  Re: Retrieving data from a table

                  Mike,
                  Thank you so much for your effort. It will take us a few days to go through the complete work you created. I am truly grateful for your help.

                  Comment

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