On Sun, Jul 26, 2009 at 03:36:26PM -0400, Robert James wrote: > Can anyone > recommend any papers or web pages which provide some good theoretical > background for aggregate functions? My knowledge of relational algebra is somewhat non-existent as well; I tend to just think of them as a "fold" from normal functional programming. The Wikipedia page is a reasonable description: http://en.wikipedia.org/wiki/Fold_(higher-order_function) Not sure how helpful that is though! -- 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
