2007/9/10, Martijn van Oosterhout <kleptog@svana.org>:
> On Mon, Sep 10, 2007 at 08:44:07PM +0500, rihad wrote:
> > Hi, I have two columns start_time & stop_time declared as "TIME". I'd
> > like to compute the difference between the two times in seconds, all in db:
> >
> > SELECT
> > (CAST(stop_time AS SECONDS) + 86400 - CAST(start_time AS SECONDS))
> > % 86400;
>
> At a guess I'd say you should simply subtract the two (ie stop_time -
> start_time) and then use extract() to pull the seconds out.
>
> Have a nice day,
> --
> Martijn van Oosterhout <kleptog@svana.org> http://svana.org/kleptog/
> > From each according to his ability. To each according to his ability to litigate.
>
sample:postgres=# select extract(epoch from time '10:01:30' - time '10:00:00');
date_part
-----------
90
(1 row)
Regards
Pavel Stehule