http://thoughts.davisjeff.com/2009/08/02/what-is-the-deal-with-nulls/ http://thoughts.davisjeff.com/2009/08/02/what-is-the-deal-wi... A lot of people make the

http://thoughts.davisjeff.com/2009/08/02/what-is-the-deal-with-nulls/ http://thoughts.davisjeff.com/2009/08/02/what-is-the-deal-wi... A lot of people make the mistake of trying to understand SQL NULL, like it's some kind of intelligent system with an underlying model behind it. It's not. It's a collection of various special-case behaviors that "make sense" in some contexts and cause confusion in many others.