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GROUP BY Vs DISTINCT

  • August 3, 2010 at 5:47 am

    #141489

    HI,

    Is there any performance difference compare to GROUP BY Vs DISTINCT,

    SELECT DISTINCT FNAME

    FROM TBL

    OR

    SELECT FNAME

    FROM TBL

    GROUP BY FNAME

    🙂

  • August 3, 2010 at 6:23 am

    #1201467

    No. check the exec plans. They're identical.

    Personal preference - if distinct rows are wanted, use distinct. If aggregates are needed grouped by one or m ore columns, use GROUP BY

    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

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