Re: Codd's Information Principle

From: paul c <>
Date: Wed, 04 Nov 2009 17:23:07 GMT
Message-ID: <%LiIm.51507$PH1.34302_at_edtnps82>

Bob Badour wrote:
> paul c wrote:

>> Do you mean certain negations and disjunctions aren't amenable, such 
>> as the predicate "it is not the case that the temperature T in city C 
>> is T degrees"?
>> (Thanks for the precision, still pondering the rest.)

> No. First, you have T representing 2 different measures so I cannot
> understand your example.
> I mean the predicate for "Employee, EmpID, manages department, DeptNo"
> is too complex to calculate or to represent algebraically. It has all
> sorts of complex factors that generally never get recorded anywhere such
> as someone had to apply for a job with the company and that person had
> to perform well enough to get promoted to management (not necessarily at
> this company) etc.
> ...

And thank goodness for that! Received on Wed Nov 04 2009 - 18:23:07 CET

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