-----Original Message----- From: pgsql-general-owner@xxxxxxxxxxxxxx [mailto:pgsql-general- On Tue, May 12, 2009 at 01:23:14PM +0800, Ow Mun Heng wrote: >> | sum of count | sum_of_count_squared | qty | qty < 100 | qty < 500 | >> >> >> I'm thinking of lumping them into 1 column via an array instead of into >> 5 different columns. Not sure how to go about this, hence the email to >> the list. >The normal array constructor should work: > > SELECT ARRAY[MIN(v),MAX(v),AVG(v),STDEV(v)] > FROM (VALUES (1),(3),(4)) x(v); > >Not sure why this is better than using separate columns though. Maybe a >new datatype and a custom aggregate would be easier to work with? The issue here is the # of columns needed to populate the table. The table I'm summarizing has close to between 50 to 100+ columns, if the 1:5x is used as a yardstick, then the table will get awfully wide quickly. I need to know how to do it first, then test accordingly for performance and corner cases. -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
