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How do I set a compound constraint in M-SQL2008 ?

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  • How do I set a compound constraint in M-SQL2008 ?

    I'd like my table to be:

    Table1.SalesDate
    Table1.CompanyID
    Table1.Comment
    Table1.SalesDate_CompanyID = PK

    How do I ensure that SalesDate and CompanyID are only in the table once?

    Normally, I would make SalesDate and CompanyID a compound PK, but I'm wondering how to do it with a single ID....

    This is good
    3/6/2012, Company1, blahblah, 1
    3/6/2012, Company2, blhablah, 2
    3/7/2012, Company1, blahblah, 3

    This is bad (because Company1 is in there twice for 3/6/2012)
    3/6/2012, Company1, blahblah, 1
    3/6/2012, Company2, blahblah, 2
    3/6/2012, Company1, blahblah, 3
    MSQL since 2010
    A5V11 since Feb 2012

  • #2
    Re: How do I set a compound constraint in M-SQL2008 ?

    Hi there Marion,

    What you need is to set up in your table a composite primary key of SalesDate and CompanyID.

    You can do that in a simple way by holding the control key in design mode of your table and select SalesDate and then CompanyID, after that right click and select set primary key ---> that will ensure that the combination will always be unique.

    Comment


    • #3
      Re: How do I set a compound constraint in M-SQL2008 ?

      Thanks Maroine but I didn't explain properly

      I know how to have SalesDate and CompanyID set as a compound Primary Key; that works perfectly for me.

      I was contemplating setting an autoincrement, single PK (such as SalesDateCompanyID)

      and, if I did that, I was not sure how to ensure that the two individual fields would be a unique combination.

      It's not crucial -I was just self-doubting that I'd done the right thing

      Based on your response, I think having the composite primary key is the actual way to do it, so I'll leave it be that way
      MSQL since 2010
      A5V11 since Feb 2012

      Comment


      • #4
        Re: How do I set a compound constraint in M-SQL2008 ?

        I apologize i misunderstood your question:

        Try this:

        Open your table
        Click Table Designer
        Select Indexes/Keys
        Click Add
        in Columns select SalesDate and CompanyID
        isUnique = yes
        Type=Unique Key
        Click close

        ----> hope this helps

        Comment


        • #5
          Re: How do I set a compound constraint in M-SQL2008 ?

          ahhhhh - so simple

          Thank you
          MSQL since 2010
          A5V11 since Feb 2012

          Comment


          • #6
            Re: How do I set a compound constraint in M-SQL2008 ?

            You're welcome

            Comment

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