Advice used to be that "natural keys can only be primary if they don't change" but there was always an exception to the rule after a few months. On the other h

Advice used to be that "natural keys can only be primary if they don't change" but there was always an exception to the rule after a few months. On the other hand, I remember a CEO wanting to be #1 in the database, so even non-natural primary keys can change... haha.