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

Hugo Kornelis wrote:
[...]
> And NULL should always propagate
> in logic - i.e. expr1 log-oper expr2 should always result in NULL if
> either expr1 or expr2 is NULL, regardless of the value of the other
> expression and regardless of the logical operator.

Then you have a four-valued logical mongrel half-Kleene's (or Lukasiewicz's) and half-Bochvar's which you intend to use in an ad hoc fashion without clearly understanding what each truth value {true, false, unknown, meaningless (aka NULL) } is supposed to model. I am not sure if anyone can find a system like that very useful..

>
> Or, to make a long story a lot shorter: I disagree with Codd's views aas
> outline in this paper.
>
> Best, Hugo
> --
>
> (Remove _NO_ and _SPAM_ to get my e-mail address)
Received on Thu Dec 22 2005 - 14:52:31 CST