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Computed Column is slowing down performance on a simple select statement

  • April 6, 2012 at 9:52 am

    #1470162

    Try running the query as a UNION ALL instead and see if your query plan is any better. While it shouldn't make a difference when you upgrade to SQL 2008, SQL 2000 was not always so good parsing OR conditions.

    DECLARE @LName --HTML encoded last name as input parameter from user

    SELECT * FROM

    (SELECT LNameComputedColumn

    FROM SomeView xtra

    WHERE @LName <> '' AND xtra.LNameComputedColumn=@LName

    UNION ALL

    SELECT LNameComputedColumn

    FROM SomeView xtra

    WHERE @Lname='')

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