On Wed, Jun 02, 2010 at 04:47:01PM +0200, A. Kretschmer wrote: > In response to Sam Mason : > > SELECT c.* > > FROM customer c, ( > > SELECT *, row_number() OVER () > > FROM (VALUES (23), (56), (2), (12), (10)) x) x(val,ord) > > WHERE c.id = x.val > > ORDER BY x.ord; > > Wow, that's really cool and a nice case for row_number(). Just thinking about it now; do SQL's semantics say it'll always do the right thing? PG does in a couple of quick tests (i.e. one where customer is a small table and PG prefers a seqscan and where it's larger and prefers an index scan) but I'm not sure if this could change. -- Sam http://samason.me.uk/ -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
