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

On 22 Dec 2005 12:52:31 -0800, vc wrote:

>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..

Hi vc,

Agreed. That's why I wrote:

>>*IF* one decides to store truth values in a database (which I don't
>>necessary consider a good idea),

Best, Hugo

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