--CELKO-- wrote:
> >>, I do not recall that Codd's original specification of 1NF allowed NULL. <<
>
> Yep, right from the start in RM1 as rule #3:
>
> 3. Systematic treatment of null values
Demanding a systematic treatment of NULL values because that was SQL
main way to handle missing information, is more of a recognition by
Codd of a realistic context but it does not mean in any case
acceptance. Acceptance of NULL values simply defeats the purpose of RM.
Received on Mon Jan 08 2007 - 03:21:02 CST
