Hi, Which would be better to do, max() or select .. order by limit 1? Is 7.1 much better than 7.0.3 in doing the "limit 1"? I see that their EXPLAINs are different - 7.1 has a limit cost. (pid is a serial in the ep_posts table) *** For Version 7.0.3 lylyeoh=# explain select max(pid) from ep_posts; NOTICE: QUERY PLAN: Aggregate (cost=8.50..8.50 rows=1 width=4) -> Seq Scan on ep_posts (cost=0.00..8.00 rows=200 width=4) EXPLAIN lylyeoh=# explain select pid from ep_posts order by pid desc limit 1; NOTICE: QUERY PLAN: Index Scan Backward using ep_posts_pid_key on ep_posts (cost=0.00..26.20 rows=200 width=4) EXPLAIN *** For version 7.1beta4 explain select max(pid) from ep_posts; NOTICE: QUERY PLAN: Aggregate (cost=8.50..8.50 rows=1 width=4) -> Seq Scan on ep_posts (cost=0.00..8.00 rows=200 width=4) EXPLAIN lylyeoh=> explain select pid from ep_posts order by pid desc limit 1; NOTICE: QUERY PLAN: Limit (cost=0.00..0.13 rows=1 width=4) -> Index Scan Backward using ep_posts_pid_key on ep_posts (cost=0.00..26.20 rows=200 width=4) EXPLAIN ---------------------------(end of broadcast)--------------------------- TIP 2: you can get off all lists at once with the unregister command (send "unregister YourEmailAddressHere" to [EMAIL PROTECTED])