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help / color / mirror / Atom feedFrom: Pham, Thinh <tpham@mail.priority.net>
To: 'pgsql-sql@postgreSQL.org' <pgsql-sql@postgreSQL.org>
Subject: RE: [SQL] datediff function
Date: Tue, 17 Aug 1999 08:18:55 -0500
Message-ID: <551413BBBB03D111BF880060B01AACCE139F34@home.priority.net> (raw)
What happen if i just want to compare using minute only or hour only instead
of day? Is there a function to do that or is postgres only work in day?
T.
> -----Original Message-----
> From: Herouth Maoz [mailto:herouth@oumail.openu.ac.il]
> Sent: Tuesday, August 17, 1999 6:05 AM
> To: tjk@tksoft.com; tpham@mail.priority.net
> Cc: pgsql-sql@postgreSQL.org
> Subject: Re: [SQL] datediff function
>
>
> At 02:26 +0300 on 17/08/1999, tjk@tksoft.com wrote:
>
>
> >
> > I think what you are looking for is age()
> > E.g.
> >
> > "update schedule set purged = 0 where age('now',dayin) >
> timespan('30
> >days'::reltime)"
> >
> > Presuming a table such as this:
> >
> > create table schedule (purged int, dayin datetime);
> >
> > This replaces "day" and "timein" with "dayin."
>
> Basically correct, but if there is an index on dayin, it
> won't be used. The
> best query to do would be
>
> WHERE dayin > 'now'::datetime - '30 days'::timespan;
>
> Herouth
>
> --
> Herouth Maoz, Internet developer.
> Open University of Israel - Telem project
> http://telem.openu.ac.il/~herutma
>
>
>
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To: pgsql-sql@postgresql.org
Cc: tpham@mail.priority.net
Subject: RE: [SQL] datediff function
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