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sets using same child twice.

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    #1

    sets using same child twice.

    To Peter Greulich,

    Would you pls expound your suggestion.
    Thanks for you help 1/12/2001.
    In Portugal we have difficulty reading attachments sometimes, I guess due to accent settings etc. I couldn�t read yours.
    I got the three tables set up, and working in a set. It works for the first machine only. I suppose I am not getting something simple,
    a) what is the purpose of the linking table? In our case, at least, the machine number is the linking field. Thus both of the fields in the linking table will be the same for each record - why have it?
    b) You say the second field of the linking table should have table lookup field rule of the machines table, machine ID field. what is that supposed to do?
    c) most baffling to me, how is the info of the second (and 3rd,4th,etc)machine number required supposed to get from the contract table to anywhere.

    I can see the concept of using lookup rules instead of sets to get over this problem of using the same child db more than once, but isn�t that getting away from the idea of a relational database altogether?

    Maybe I have not explained myself.
    We write a contract, it has one client, who can rent several different machines.
    We have a file of clients. We have a different file of machines.
    In the main contract table we have, for example simplified, 3 lines:
    -client number: to call the client details, no problem, a one-to-one link to the client table.
    -first machine number: to call the first machine from the machine list table.
    -second machine number: to call the second machine from the same machine list table as above.

    From your info, the second machine number in the contract doesn�t do anything, and therefore doesn�t work.
    Thanks again for your help.

    Brian.
    Tags: None
    #2
    RE: sets using same child twice.

    brian,

    I am not sure what your past conversation was, but:

    You can make a set and use a child table several times:
    1 parent field for each occurance of the child table

    I have not successfully used the master table with the master as a child. I can do this with VB.

    You can also use a parent child with multiple child records. You can have a child table with all the sales/rentals and create another table with all the payments made and total to get balances.

    I am not sure what you are tryig to do, but would be willing to help with my limited knowledge.

    Dave

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      #3
      RE: sets using same child twice.

      Brian
      I'll try this again. Down load the attachment and extract it to a separate folder. Than run the rental.adb it does just what you want to do. I have used the same child linked to the parent without problem many times. I added a second lookup to the second child in this zip file. So don't use the old one. Just try it. It has worked for me for years. These files were pulled from my rental application. I just made a simple form for demonstration. We are working on preparing our application for sale but it will be some time before it is ready.

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        #4
        RE: sets using same child twice.

        Brian
        I have been away for a few days, I will respond to you when I get a few minute.

        FYI: It is better (in the future) to use the same thread for the same subject matter. I always keep the "Latest Reply" column of the Message Board set to "Sort Desc" - which, paradoxically, will leave the label of "Sort Asc" displayed. That way, you always see the most recent posts on top, regardless if they are a new post or a response to an old post.

        Peter
        Peter
        AlphaBase Solutions, LLC

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

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