On Thu, Mar 23, 2006 at 01:09:49PM +0200, Theo Kramer wrote: > ii If no to i, is it feasible to extend PostgreSQL to allow traversing > an index in column descending and column ascending order - assuming > an order by on more than one column with column order not > in the same direction and indexes existing? ... if that makes sense.
Yes. stats=# explain select * from email_contrib order by project_id desc, id desc, date desc limit 10; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------ Limit (cost=0.00..31.76 rows=10 width=24) -> Index Scan Backward using email_contrib_pkey on email_contrib (cost=0.00..427716532.18 rows=134656656 width=24) (2 rows) -- Jim C. Nasby, Sr. Engineering Consultant [EMAIL PROTECTED] Pervasive Software http://pervasive.com work: 512-231-6117 vcard: http://jim.nasby.net/pervasive.vcf cell: 512-569-9461 ---------------------------(end of broadcast)--------------------------- TIP 1: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly