Re: convert time format retuned by a select query

Hello,
>
> I would like to subtract two columns - create_time and update_time
> of 'timestamp without time zone' type and then order results based
> on subtraction-result (time interval). I checked http://
> www.postgresql.org/docs/current/static/functions-datetime.html ,
> however these examples didn't work with actual column values.
> e.g.something like:
> 'select epoch (update_time) - epoch (create_time) AS Column1 from
> users order by Column1; '
Will this do?
test=# select update_time, create_time, update_time-create_time as diff
from myt
order by update_time-create_time desc;
update_time | create_time | diff
-------------------------+-------------------------+-----------------
2011-12-12 00:09:28.852 | 2011-12-09 09:09:28.852 | 2 days 15:00:00
2011-12-11 19:09:22.619 | 2011-12-09 09:09:22.619 | 2 days 10:00:00
2011-12-11 09:09:15.744 | 2011-12-09 09:09:15.744 | 2 days
2011-12-10 09:09:10.104 | 2011-12-09 09:09:10.104 | 1 day
(4 rows)

Regards,
Jayadevan

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