Hi , I am trying to improve a query to use existing indexes but facing diffculty.
Looks like 'between' amd '>=' are not using indexes althoug > and < does. all my application code uses between and i am sure it use to work fine at one point of time. regds mallah. SQL TRANSCRIPT: ====================================================================================== tradein_clients=> explain select list_id from eyp_rfi a where generated > '2002-08-13' and generated < '2002-09-19' ; NOTICE: QUERY PLAN: Index Scan using eyp_rfi_date on eyp_rfi a (cost=0.00..15796.97 rows=4150 width=4) EXPLAIN tradein_clients=> explain select list_id from eyp_rfi a where generated >= '2002-08-13' and generated < '2002-09-19' ; NOTICE: QUERY PLAN: Seq Scan on eyp_rfi a (cost=0.00..17923.81 rows=5061 width=4) EXPLAIN tradein_clients=> explain select list_id from eyp_rfi a where generated >= '2002-08-13' and generated <= '2002-09-19' ; NOTICE: QUERY PLAN: Seq Scan on eyp_rfi a (cost=0.00..17923.81 rows=5061 width=4) EXPLAIN tradein_clients=> explain select list_id from eyp_rfi a where generated between '2002-08-13' and '2002-09-19' ; NOTICE: QUERY PLAN: Seq Scan on eyp_rfi a (cost=0.00..17923.81 rows=5061 width=4) EXPLAIN tradein_clients=> ====================================================================================== -- Rajesh Kumar Mallah, Project Manager (Development) Infocom Network Limited, New Delhi phone: +91(11)6152172 (221) (L) ,9811255597 (M) Visit http://www.trade-india.com , India's Leading B2B eMarketplace. ---------------------------(end of broadcast)--------------------------- TIP 6: Have you searched our list archives? http://archives.postgresql.org