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Lookupc() function "stuck"

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    #1

    Lookupc() function "stuck"

    I have 2 tables, TableA and TableB. I made the field 'B_maxisnumber" in TableB a calculated field with the following expression:

    Lookupc("C","B_maxisnumber","A_maxisnumber","t_tableA","maxis_numb")

    A_maxisnumber is the corresponding field in TableA and maxis_numb is an index in each table for the B_maxisnumber and A_maxisnumber fields.

    In the expression builder, it shows the first record but as I scroll through the records, the value doesn't change, it remains constant.

    What am I missing?

    Thanks,

    kenn
    TYVM :) kenn

    Knowing what you can achieve will not become reality until you imagine and explore.
    Tags: None
    #2
    Re: Lookupc() function "stuck"

    Ken,

    Are the fields the exact same size and layout? Is the index expression the same? If not, try padr() or padl() to make the fields match.

    One other thought is that the expression may just be fine, but because it is a calculated field, you might just need to recalc the calculated fields. Right click on the table and under Utilities, there is the recalc option.

    Hope this helps,

    Tom

    Comment

      #3
      Re: Lookupc() function "stuck"

      Nice work Kenn.. you explained it very well to those who never understood before what a catch 22 is!

      You are looking up the closest match to the value in a field, but that field's value is a calculated one derived from the lookup value!

      Very cute!

      Did we miss our coffee this morning? Or did Obama forget to bail out caffeine?

      Comment

        #4
        Re: Lookupc() function "stuck"

        He's right,

        You are trying to use a field as the key of a lookup to fill itself.

        You would need some other field common to both tables so that you can get maxisnumber from tableA to TableB.

        Comment

          #5
          Re: Lookupc() function "stuck"

          Hi Kenn,

          Originally posted by forskare View Post
          I have 2 tables, TableA and TableB. I made the field 'B_maxisnumber" in TableB a calculated field with the following expression:

          Lookupc("C","B_maxisnumber","A_maxisnumber","t_tableA","maxis_numb")

          A_maxisnumber is the corresponding field in TableA and maxis_numb is an index in each table for the B_maxisnumber and A_maxisnumber fields.

          In the expression builder, it shows the first record but as I scroll through the records, the value doesn't change, it remains constant.

          What am I missing?
          Lookupc("C",some_value,"A_maxisnumber","t_tableA","maxis_numb")


          You are looking at the 1st record in table "t_tableA" (you also called it just "tableA", so I assume that was a typo) whose index's key value in index named "maxis_numb" is greater than or equal to some_value and returning a value of expression A_maxisnumber, which better evaluate to a character value (since you are using lookupc() ) The key value of some_value should be the same type as the index's expression, typically type C, N or D

          But it needs to be a value from something, not the fieldname you want the value stuffed into.
          Regards,

          Ira J. Perlow
          Computer Systems Design


          CSDA A5 Products
          New - Free CSDA DiagInfo - v1.39, 30 Apr 2013
          CSDA Barcode Functions
          CSDA Code Utility
          CSDA Screen Capture

          Comment

            #6
            Re: Lookupc() function "stuck"

            Hi Tom,

            Everything is the same except for the field names, A & B and the table names.

            Yo, Gabe,

            No, I didn't miss it but since I dislike coffee, I had a Mountain Dew.

            I thought the function of this function is to get the value in A_maxisnumber in tableA and fill field B_maxisnumber in tableB with the value.

            Shouldn't the explanation of the Lookupc() function in A5 Help mention this?

            Thanks,

            kenn
            TYVM :) kenn

            Knowing what you can achieve will not become reality until you imagine and explore.

            Comment

              #7
              Re: Lookupc() function "stuck"

              Hi Kenn,

              Originally posted by forskare View Post
              I thought the function of this function is to get the value in A_maxisnumber in tableA and fill field B_maxisnumber in tableB with the value.
              But which record do you want in tableA? There has got to be a way (normally a value) to lookup in the index a specific record. You haven't specified a value to get to a specific record!
              Regards,

              Ira J. Perlow
              Computer Systems Design


              CSDA A5 Products
              New - Free CSDA DiagInfo - v1.39, 30 Apr 2013
              CSDA Barcode Functions
              CSDA Code Utility
              CSDA Screen Capture

              Comment

                #8
                Re: Lookupc() function "stuck"

                Originally posted by csda1 View Post
                Lookupc("C",some_value,"A_maxisnumber","t_tableA","maxis_numb")

                You are looking at the 1st record in table "t_tableA" (you also called it just "tableA", so I assume that was a typo) whose index's key value in index named "maxis_numb" is greater than or equal to some_value and returning a value of expression A_maxisnumber, which better evaluate to a character value (since you are using lookupc() ) The key value of some_value should be the same type as the index's expression, typically type C, N or D

                But it needs to be a value from something, not the fieldname you want the value stuffed into.
                Hi Ira,

                You made your post while I was typing my last response and I needed to do other things so just now getting back.

                I called the tables A & B for the purpose of trying to make my explanation easier. This is the actual expression:

                LOOKUPC("C","A_Maxisnumber","A_Maxisnumber","t_clients","Maxis_Numb")

                The fields in both tables now the same name, A_Maxisnumber.

                kenn
                TYVM :) kenn

                Knowing what you can achieve will not become reality until you imagine and explore.

                Comment

                  #9
                  Re: Lookupc() function "stuck"

                  Ken,

                  Just so I understand. You are trying to fill field "A_maxisnumber" in table B with the value of "A_maxisnumber" from Table A, right?

                  If so, in table B, before the lookup, "A_maxisnumber" is empty until filled. Your lookup is attempting to use this field to lookup into table A. As there is no value in this field to beginwith, it can't find anything in table A. You would need to use some different field common to both tables as the lookup key in order to fill the field "A_maxisnumber".

                  Tom

                  Comment

                    #10
                    Re: Lookupc() function "stuck"

                    Oh My, Oh My, Oh Oh

                    I think I found the problem. Some how, the value of the maxisnumber field in TableA changed to the value of this field in the first record so now, all records have the same value. Good thing I have backups.

                    kenn
                    TYVM :) kenn

                    Knowing what you can achieve will not become reality until you imagine and explore.

                    Comment

                      #11
                      Re: Lookupc() function "stuck"

                      Ken, be very careful here...

                      Ihave 2 tables, TableA and TableB. I made the field 'B_maxisnumber" in TableB a calculated field with the following expression:

                      Lookupc("C","B_maxisnumber","A_maxisnumber","t_tableA","maxis_numb")
                      You're using a field - "B_maxisnumber" as a key into tableA to fill itself. If B_maxisnumber is blank to start with, then the closest match will be the lowest value of "A_maxisnumber" in tableA for ALL records where "B_maxisnumber" is initially blank.

                      Tom

                      Comment

                        #12
                        Re: Lookupc() function "stuck"

                        Originally posted by Tom Henkel View Post
                        Ken,

                        Just so I understand. You are trying to fill field "A_maxisnumber" in table B with the value of "A_maxisnumber" from Table A, right?

                        If so, in table B, before the lookup, "A_maxisnumber" is empty until filled. Your lookup is attempting to use this field to lookup into table A. As there is no value in this field to beginwith, it can't find anything in table A. You would need to use some different field common to both tables as the lookup key in order to fill the field "A_maxisnumber".

                        Tom
                        Hi Tom,

                        You are correct in your assessment but my understanding is not the same as yours. This is what I understand:

                        Key value = the value in the A_maxisnumber field of TableA. To get this value, one must use the field name which contains the sought after value.
                        Lookup Expression = The field in TableA which contains the value which is A_maxisnumber.
                        Lookup Table = The table which contains the field (A_maxisnumber) which contains the value to be obtained.
                        Index = The index in the Lookup Table, TableA, which is based on the field, A_maxisnumber. The same index exists in TableB for the common field, A_maxisnumber.

                        Since this expression is in the field rules for the field A_maxisnumber in TableB, it should 'get' and 'set' the value. The common linking field is a_maxisnumber. Is it possible one cannot do this with the common field itself?

                        Thanks,

                        kenn
                        TYVM :) kenn

                        Knowing what you can achieve will not become reality until you imagine and explore.

                        Comment

                          #13
                          Re: Lookupc() function "stuck"

                          Since this expression is in the field rules for the field A_maxisnumber in TableB, it should 'get' and 'set' the value. The common linking field is a_maxisnumber. Is it possible one cannot do this with the common field itself?
                          what value from table B will it use to retrieve the field from tableA if the field is initially blank?

                          Tom

                          Comment

                            #14
                            Re: Lookupc() function "stuck"

                            Originally posted by Tom Henkel View Post
                            what value from table B will it use to retrieve the field from tableA if the field is initially blank?

                            Tom
                            What I don't understand is why it is going to retrieve a value from tableB if tableB is not part of the expression. Does the expression not say to look in tableA?

                            kenn
                            TYVM :) kenn

                            Knowing what you can achieve will not become reality until you imagine and explore.

                            Comment

                              #15
                              Re: Lookupc() function "stuck"

                              you're telling it to use the value of the field "B_maxisnumber" from table B to lookup into table A.

                              Comment

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