But the demeaning ridicule that gets thrown at me is ? (BTW I doubt very much that "Codd designed null into the RM". Even his 12 rules mention only "a systemi

But the demeaning ridicule that gets thrown at me is ? (BTW I doubt very much that "Codd designed null into the RM". Even his 12 rules mention only "a systemic way to deal with missing information", not "null".)