Hi, Thanks for the several replies both on and off the list.
To be more specific, I am wanting to aggregate data to a 5/10/15 min interval. Currently, I am aggregating data that falls in hour / day / month / year periods for both count() and sum(). The sql I am currently using is: SELECT count(id) AS count, sum(conn_bytes) AS sum, hisec_port, conn_protocol, date_trunc('hour'::text, datetime) AS date_trunc FROM trafficlogs WHERE (conn_outbound = false) GROUP BY date_trunc('hour'::text, datetime), conn_protocol, hisec_port HAVING (count(*) = ANY ( SELECT count(*) AS count FROM trafficlogs GROUP BY hisec_port, date_trunc('hour'::text, datetime) ORDER BY count(*) DESC) ); Which produces: count sum hisec_portconn_protocol date_trunc 12 192 5,050 2003/09/17 00:00:00 11 176 5,050 2003/09/17 01:00:00 12 192 5,050 2003/09/17 02:00:00 11 176 5,050 2003/09/17 03:00:00 10 160 5,050 2003/09/17 04:00:00 - if you know of a more efficient way to do this than the sql above, pls let me know In my previous post I should have said I wanted to aggregating data in 5/10/15 min intervals in a similar manner to the above ---------------------------(end of broadcast)--------------------------- TIP 5: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faqs/FAQ.html