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/
