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Derived Column - Source and Destination Table are the same

  • July 17, 2008 at 6:02 am

    #123223

    The source table (Customers) contains these three columns:

    Customer_Code_and_Name

    Customer_Code

    Customer_Name

    Customer_Code and Customer_Name are empty, I want to update these two columns with a substring of the Customer_Code_and_Name.

    I thought that the easiest way to do that is a derived column transformation.

    Source: Customers

    Transformation: Derived Column

    Destination: Customers (again)

    Now I am getting double entries in the destination table. What am I doing wrong? I expected an update of the existing rows, not adding new rows...

    Thanks!

  • July 17, 2008 at 7:41 pm

    #844740

    Its real hard to troubleshoot a problem without any code or data examples... please see the link in my signature line below.

    --Jeff Moden

    RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
    First step towards the paradigm shift of writing Set Based code:
    ________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

    Change is inevitable... Change for the better is not.

    Helpful Links:
    How to post code problems
    How to Post Performance Problems
    Create a Tally Function (fnTally)

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