How can I create a non-null date column that defaults to 'now' as computed
at the time the row is inserted?

-John

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  • Oliver Elphick at Jan 5, 2004 at 9:21 pm

    On Mon, 2004-01-05 at 21:00, John Siracusa wrote:
    How can I create a non-null date column that defaults to 'now' as computed
    at the time the row is inserted?
    The default should be either CURRENT_DATE or timeofday()::DATE

    The difference is that CURRENT_TIME, CURRENT_TIMESTAMP and CURRENT_DATE
    remain the same within a transaction even if the time or date changes,
    whereas timeofday() always returns the current clock time.

    --
    Oliver Elphick Oliver.Elphick@lfix.co.uk
    Isle of Wight, UK http://www.lfix.co.uk/oliver
    GPG: 1024D/3E1D0C1C: CA12 09E0 E8D5 8870 5839 932A 614D 4C34 3E1D 0C1C
    ========================================
    "And thou shalt love the LORD thy God with all thine
    heart, and with all thy soul, and with all thy might."
    Deuteronomy 6:5
  • Michael Glaesemann at Jan 5, 2004 at 9:30 pm
    Hi John!
    On Jan 5, 2004, at 3:00 PM, John Siracusa wrote:

    How can I create a non-null date column that defaults to 'now' as
    computed
    at the time the row is inserted?
    How about this?

    test=# create table johns (comment text not null,this_time timestamp
    not null default now(), this_date date not null default now());
    CREATE TABLE
    test=# insert into johns (comment) values ('Ars Technica rocks!');
    INSERT 1196312 1
    test=# select * from johns;
    comment | this_time | this_date
    ---------------------+----------------------------+------------
    Ars Technica rocks! | 2004-01-05 15:25:52.501707 | 2004-01-05
    (1 row)

    (If you're not the John Siracusa who writes for Ars Technica, the
    sentiment still holds. :) )

    Regards,

    Michael Glaesemann
    grzm myrealbox com
  • John Siracusa at Jan 5, 2004 at 10:17 pm

    On 1/5/04 4:29 PM, Michael Glaesemann wrote:
    (If you're not the John Siracusa who writes for Ars Technica, the
    sentiment still holds. :) )
    I am everywhere!

    (worked, thanks to both of you who replied :)
    -John
  • Gaetano Mendola at Jan 6, 2004 at 10:35 pm

    John Siracusa wrote:
    On 1/5/04 4:29 PM, Michael Glaesemann wrote:
    >
    (If you're not the John Siracusa who writes for Ars Technica, the
    sentiment still holds. :) )
    >
    >
    I am everywhere! >
    (worked, thanks to both of you who replied :)
    Anyway the two solution solve different problems:

    1) DEFAULT now()
    you'll have the timestamp of transaction

    2) DEFAULT timeofday()
    you'll have the timestamp of insertion



    Regards
    Gaetano Mendola

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