> 3) I want to use materialized views, I don?t understand it from > http://jonathangardner.net/PostgreSQL/materialized_views/matviews.html, can anyone explain me > with a simple example. The following link helps to describe the idea behind each of the methods of Materialize views. http://jarednevans.typepad.com/technoblog/2006/03/materialized_vi.html Regards, Richard Broersma Jr.