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Can you use the DATEPART function in an index?

  • July 15, 2010 at 7:37 am

    #141042

    I was just wondering if it was possible to build a non-clustered index using things like DATEPART inside of it? Such as:

    CREATE NONCLUSTERED INDEX [IX_Dates] ON ##Temp

    (

    DATEPART(YEAR,UpdatedDate) ASC,

    DATEPART(MONTH, UpdatedDate) ASC

    )

    Owner & Principal SQL Server Consultant
    Im Your DBA, Inc.
    https://www.imyourdba.com/

  • July 15, 2010 at 7:52 am

    #1193492

    Not like that.

    Look up computed columns. If a computed column adheres to a list of requirements, it can be persisted and indexed.

    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

  • July 15, 2010 at 7:58 am

    #1193496

    GilaMonster (7/15/2010)

    Not like that.

    Look up computed columns. If a computed column adheres to a list of requirements, it can be persisted and indexed.

    Oh I see. You can't use DATEPART in the index creation but I could use a computed column in building the temp table and then index that column. Makes sense.

    Thanks!

    Owner & Principal SQL Server Consultant
    Im Your DBA, Inc.
    https://www.imyourdba.com/

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