Re: Does Codd's view of a relational database differ from that ofDate&Darwin?[M.Gittens]

From: Jan Hidders <>
Date: Thu, 07 Jul 2005 18:04:06 GMT
Message-ID: <q8eze.139524$>

VC wrote:
> "Jan Hidders" <> wrote in message
> news:ZmWye.138790$

>>VC wrote:
>>>>>So what's the difference between an object and a conceptual object ?
>>>>A conceptual object is an object that is part of the universe of 
>>>>discourse that is under consideration.
>>> That's cool,  but what I was resally asking was what the difference 
>>>between an "object" and  the "conceptual object".  What is the word 
>>>"conceptual" doing here ?
>>?? You mean, apart from indicating that this particular object belongs the 
>>universe of discourse? 

> I still do not undertsand. Let's assume we define the object as an element
> belonging to a set.

Ok. Let's call that set UoE, the universe of everything.

> You are saying that a "conceptual object" belongs to a
> universe of discourse, the universe being a synonym of a set, I hope. Now,
> my question is really simple: do an "object" and a "conceptual object"
> belong to different sets ?

Yes, "object" belongs to UoE and "conceptual object" belongs to UoD, the universe of discourse, which is a subset of UoE.

  • Jan Hidders
Received on Thu Jul 07 2005 - 20:04:06 CEST

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