> I understand that subtraction of timestamps will return an interval, > but I cannot tell if it is in seconds or minutes. Neither. Because an interval can represent things like '1 year' or '1 month' which cannot be represented as a simple number of seconds or minutes. So what you want is: timestampcol1 - timestampcol2 <= '1 hour' and timestampcol2 - timestampcol1 <= '1 hour' Because intervals can be negative... BTW, you can figure out some of these things in psql, by trying things like "select '2008-03-06 08:00:00':timestamp - '2008-03-06 09:00:00'::timestamp;" -- Scott Ribe scott_ribe@xxxxxxxxxxxxxxx http://www.killerbytes.com/ (303) 722-0567 voice -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
