Home Forums SQL Server 2005 T-SQL (SS2K5) Calculating Median and Percentiles RE: Calculating Median and Percentiles

  • May 20, 2010 at 7:38 am

    #1170122

    I haven't actually tested it but I believe that +0.0 is more effecient. At the machine language level, a simple add takes about 1-2 clock cycles... whereas a multiply takes about 4-6 depending on the processor.

    I got tied up at work yesterday and didn't have much time for the forum. Perhaps the best thing to do is to refer you to a rather long winded post I did for someone else concerning MEDIAN calculations. I just need to find it and I'll try to do that after work tonight.

    --Jeff Moden

    RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
    First step towards the paradigm shift of writing Set Based code:
    ________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

    Change is inevitable... Change for the better is not.

    Helpful Links:
    How to post code problems
    How to Post Performance Problems
    Create a Tally Function (fnTally)