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  1. #1
    Join Date
    Mar 2004

    Unanswered: About Unique Constraint with Nullable field - Urgent Plz

    Hi ,

    I have a requirement where I need to create a unique constraint which accepts null value. But in DB2, a unique constraint column should be defined with NOT NULL.
    How can i do this. ?

  2. #2
    Join Date
    May 2003
    Create a regular index on the column. In your program that inserts the row, if the value is not null, do a select to see if that value already exists. If the value already exists in the table and the value is not null, then process the data as a user error.
    M. A. Feldman
    IBM Certified DBA on DB2 for Linux, UNIX, and Windows
    IBM Certified DBA on DB2 for z/OS and OS/390

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