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Using two fields to link databases

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    Using two fields to link databases

    Okay everybody here goes:

    I have two databases that have pretty similar information in them. They look like this:

    Database 1: Database 2:
    Crop Room Trays Crop Room Pounds---- ----- ----- ---- ---- ------
    1 3 430 1 3 5320
    1 5 429 1 5 4220
    2 13 433 2 13 250
    2 15 444 2 15 120
    3 2 430 3 2 6500
    3 4 432 3 4 5300

    What I want to do is join the two databases into one, or create a set that gives this result.

    Crop Room Trays Pounds
    ---- ---- ----- ------
    1 3 430 5320
    1 5 429 4220 2 13 433 250
    2 15 444 120
    3 2 430 65003 4 432 5300

    Now, I know that you are thinking this looks easy, but I haven't slept for a week trying to get this to happen. Joining the databases only finds the first record if it finds any, and a set does the same thing.

    Anyone want to take a shot at it?

    Greg Williams

    RE: Using two fields to link databases

    I just read my message and the formatting is off. I hope you can sort it out.



      RE: Using two fields to link databases

      I think I know what you want to do, but I don't understand how

      1 5 429 4220
      is related to
      2 13 433 250

      Can you explain the linkage?
      There can be only one.


        RE: Using two fields to link databases

        Maybe it's the formatting...

        If you want to link the two tables on common crop and room, decide which is the parent, probably database1.

        Start creation of a new set. When you are in the dialog box, add link, to database2. In the link box for database1 the first available field will be visible. Arrow up from that field and you are allowed choose "expression>.

        I assume crop and room numbers are numerical fields. Try the expression

        str(crop)+" ""+str(room)

        in both link boxes. If you merely add the two numbers together you may get "false" matches like (3 + 2) = (1 + 4)
        There can be only one.


          RE: Using two fields to link databases


          Again the formatting messed up what I was trying to get across. Let's look at individual records as if I had exported them to a CSV file.

          Database 1:
          Again the fields are Crop, Room, Trays

          Database 2:
          Fields are Crop, Room, Pounds

          I want to create another database like this by combining Database #1 and Database #2:
          Fields are Crop, Room, Trays, Pounds

          Now does it make sense?
          Greg Williams


            RE: Using two fields to link databases


            IT WORKED! Thank you sooooooooooo much!



              RE: Using two fields to link databases

              Got a little heavy fingered, only two quotes between the parts of the expression

              str(crop)+" "+str(room)
              There can be only one.


                RE: Using two fields to link databases

                You might consider creating a single database/table with all the information in it, since it seems that your data is consistent across the two now. You could then hide/show those fields of the record which you do not want to show on a particular form. I don't see much need for a set in this instance, but I think it could be done but would not be very beneficial to you.

                Tom Lyon