Re: Network Example: Sibling of Opposite Gender

From: Bob Badour <bbadour_at_pei.sympatico.ca>
Date: Sat, 30 Dec 2006 18:51:28 GMT
Message-ID: <Qyylh.38752$cz.570437@ursa-nb00s0.nbnet.nb.ca>

Lennart wrote:

>>Cimode wrote:
>>[...]
>>
>>>Also you should keep in mind that NO NULL value should be allowed in
>>>the first place.  Any solution involving NULLS is not 1NF and therefore
>>>is a hack...

>
> BTW, do you have any - preferably free of charge - references where
> nulls and 1NF are discussed. I don't have an pay pal account, hence
> unable to get a copy of Date's and Pascal's articles that you referred
> to somewhere else in this thread.
>
> /Lennart

Check out some of the articles at:

http://www.thethirdmanifesto.com/

In particular, try:
http://www.dcs.warwick.ac.uk/~hugh/TTM/Missing-info-without-nulls.pdf Received on Sat Dec 30 2006 - 12:51:28 CST