I thought it was a very good article. Perhaps a few more illustrations of the "normalized" tables that you described (ER diagram maybe?). As to the Anti-NULL zealots... you aren't going to get a lot of people to agree by being a jerk, so stop trying to be a jerk. To Steven's previous post... What about the Empty Set, surely that is a subset of the domain or did my set theory professor get that one wrong, wouldn't the empty set be equivalent to the BOTTOM or Null?