Re: How to find Brothers and Sisters?

From: Cimode <cimode_at_hotmail.com>
Date: 8 Jan 2007 01:21:02 -0800
Message-ID: <1168248062.185222.138480_at_42g2000cwt.googlegroups.com>

--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 - 10:21:02 CET

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