Nuance of datetime data type in SQL Server

  • james.brown.iphone

    Valued Member

    Points: 63

    Would it not be easier to just cast both variables to the time data type and catch any error (or is there IsTime function?)

  • GeorgeCopeland

    SSCertifiable

    Points: 6954

    james.brown.iphone - Tuesday, April 18, 2017 11:45 AM

    Would it not be easier to just cast both variables to the time data type and catch any error (or is there IsTime function?)

    Casting a time to a datetime does not throw an error, that is the point of the article. IsDate returns 1 on a valid time value.

  • Jeff Moden

    SSC Guru

    Points: 997212

    GeorgeCopeland - Thursday, April 13, 2017 1:54 PM

    Thinking like this has caused more bugs over the last 70 years than the NULL. It is thinking like this that gave the world Y2K.

    Heh... Agreed.  And worse than that, it is thinking like this that gave us the crippled DATETIME2 data type, which ultimately gave rise to the need got DATEDIFF_BIG.

    --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".
    "Dear Lord... I'm a DBA so please give me patience because, if you give me strength, I'm going to need bail money too!"

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

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