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always use incorrect index to run the query by sql server

  • March 9, 2010 at 5:15 am

    #1130563

    ColinChen (3/8/2010)

    Thanks for everyone.

    Now I found the issue:

    Because the fieldB is varchar , and the fieldC is nvarchar.

    select * from tableA where fieldB in(select fieldc from tablec)

    If I alter the fieldC to varchar, the index on fieldB is used.

    Yeah... that'll do it, too. Thanks for posting back the solution you found.

    --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)

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