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Add a unique constraint to an existing table

  • October 18, 2012 at 10:40 am

    #283170

    Hi, I have a table that includes columns

    Firstname, lastname and Birthdate. How do I add a unique constraint on these three fields?

    Thanks!!

  • October 18, 2012 at 10:44 am

    #1550606

    ALTER TABLE SomeTable ADD CONSTRAINT UQ_Firstname_lastname_Birthdate UNIQUE (Firstname,lastname,Birthdate)

    Lowell

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  • October 18, 2012 at 10:47 am

    #1550607

    So people with the same name never share a birthday?

    Gail Shaw
    Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
    SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

    We walk in the dark places no others will enter
    We stand on the bridge and no one may pass

  • October 18, 2012 at 10:51 am

    #1550609

    Yes, that is correct.

  • October 18, 2012 at 11:04 am

    #1550616

    Thanks!

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