2009/5/22 Brandon Metcalf <brandon@xxxxxxxxxxxxxxxxxx>: > That does help. So, in my example of a table consisting of rows for > each periodic table element, the atomic number would suffice as a > unique key since, well, it's unique and not going to change. Right? Well, yes :) At least that's my opinion and experience. Now, having said that, you're good until physics doesn't question some of the math there, and doesn't change that number for some reason ;) -- GJ -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general