"Directive 595 is as follows: 'Not null constraints give lack of flexibility, more costly evolution, inhibit the use of the database acting as a service to appl

"Directive 595 is as follows: 'Not null constraints give lack of flexibility, more costly evolution, inhibit the use of the database acting as a service to applications and make it an inhibitor to evolution.' As such, please remove from all production databases." To find out how this ends: http://thedailywtf.com/Articles/Directive-595.aspx http://thedailywtf.com/Articles/Directive-595.aspx