Re: Another view on analysis and ER

From: Bob Badour <>
Date: Tue, 18 Dec 2007 08:06:31 -0400
Message-ID: <4767b7c9$0$5271$>

David Cressey wrote:

> "rpost" <> wrote in message
> news:c1f35$4766eca5$839b4533$

>>David Cressey wrote:
>>>The question of whether it's "the same entity" or "a different entity "

> is
>>>also moot.
>>Until you consider other relations referring to the same entity.
>>Their attributes may or may not have to be updated as well.

> Are they really "referring to the same entity"? Or are they "referring to
> data values that describe and/or identify some entity"? Can an entity be
> identified without data?

That depends on your definition of data. Can you identify yourself if nothing about you has been represented suitably for machine processing?

I think you can. You can probably even communicate that identity to another human without representing anything suitably for machine processing. You can probably even identify Grandpa's Axe with a grunt and a gesture.

However, we cannot manage data without data, and database theory is all about managing data. Received on Tue Dec 18 2007 - 13:06:31 CET

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