You know, in those blog pages of consulting firm like ours, people tend to brag about their expertise, uncovering tidbits about DMVs nobody uses or giving a history lesson about Dr. E.F.Codd. We can do that. And We are guilty of that too, sometimes. But there's a place for "simple facts" too, and we think that there's relative lack of such simply stated facts on the web. Take, for instance, just google "Primary Key", and you are immediately overwhelmed by detailed CREATE TABL