Re: compound propositions

From: Mr. Scott <>
Date: Mon, 29 Mar 2010 22:31:29 -0400
Message-ID: <>

"paul c" <> wrote in message news:2oprn.364$Z6.28_at_edtnps82...
> Mr. Scott wrote:

>> "paul c" <> wrote in message 
>> news:XEvnn.71100$PH1.31420_at_edtnps82...

> ...
>>> One reason is that I still don't know how Codd's Information Principle 
>>> applies to compound propositions, eg., " 'C1' is a customer OR 'C1' is a 
>>> client".  I can see that humans might imagine themselves capable of 
>>> interpreting a relation (or to put it redundantly a relation value) as 
>>> implitly mentioning that 'OR' connective (and dba's might so instruct 
>>> their users).  But where is it recorded?  (or 'manifested'?)  Eg., is it 
>>> 'recorded' only in the ephemeral form of an expectation that a program's 
>>> execution can't manifest given a single relation to operate on?
>> I'm confused.  Are you trying to find a way to avoid using nulls?  ...

> No, I didn't have that in mind. Until I can put the question more
> coherently I do have a comment about 'avoiding nulls' and no offense
> intended - the phrase seems so unfortunate to me, as if it means some kind
> of detour or deviation from orthodoxy. Not unlike how so many expressions
> in other fields sooner or later acquire the opposite meaning from the
> original. I suppose 'avoiding nonsense' covers the same intended ground
> but bothering to keep either figment constantly in mind seems a waste of
> time to me. I suppose there are purists in all fields who feel a need to
> rebut every cockamamie nuance spouted by half-assed practitioners.

Nulls are not nonsense. They're merely a device that permits the recording of disjunctive information in neat tabular format. Received on Mon Mar 29 2010 - 21:31:29 CDT

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