In response to Ivan Sergio Borgonovo : > Hi, > > I'd like to know if > > select sum(qty) from t where status=37; > > is > constant. > > qty is always >0. > > Is there a way to skip examining further rows and return a result > ASAP?
I think no. But you can create a new table with 2 columns: status (primary key) and a column for the sum of qty. And you need a TRIGGER: update this table for every insert, update and delete on your table t. Now you can ask _this_ new table if the sum(qty) > your constant, this should work very fast. Just an idea... Andreas -- Andreas Kretschmer Kontakt: Heynitz: 035242/47150, D1: 0160/7141639 (mehr: -> Header) GnuPG: 0x31720C99, 1006 CCB4 A326 1D42 6431 2EB0 389D 1DC2 3172 0C99 -- Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-sql
