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Unique Key Combination

  • March 30, 2009 at 8:15 am

    #136203

    How would you enforce a unique key combination? For example, I have columns A and B in a table. I don't want A and B to be unique by themselves, but I want the combination of A and B in a single record to be unique. How would I do this? I've Googled for unique key combinations, but all I get are guides on setting up your basic unique keys, which isn't what I want. Does SQLServer support this?

    Regards,

    Chris

  • March 30, 2009 at 8:18 am

    #968370

    ALTER TABLE < Table name >

    ADD CONSTRAINT < Constraint Name > UNIQUE (ColA, ColB)

    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

  • March 30, 2009 at 8:28 am

    #968384

    Thanks!

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