Re: So what's null then if it's not nothing?

On Thu, 15 Dec 2005 09:09:49 +0100, Jon Heggland wrote:

>> It's possible, of course, but I'm more inclined to believe that they
>> didn't realise they were breking the NULL propagation rule when they
>> wrote it. Or they did realize but didn't care.
>
>And/or they just read Codd the way I do. How do you other folks
>understand that article, by the way?

Hi Jon,

Are you refering to the "Much ado about nothing" article on the dbdebunk site (http://www.dbdebunk.com/page/page/1706814.htm)?

If so, I don't see how Codd's opinions as cited on that page can be construed to allow a boolean datatype that doesn't distinguish NULL from UNKNOWN and that breaks NULL propagation.

Best, Hugo

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