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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