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Re: Date of Birth as an attribute

From: Tom Hester <$$tom_at_metadata.com>
Date: Wed, 7 Apr 2004 08:51:40 -0700
Message-ID: <d50d6$40742393$45033832$16071@msgid.meganewsservers.com>


Certainly calling the relational model the logical model makes both practical and theoretical sense; and calling the ER-level the conceptual model makes sense too, although I personally prefer requirements model or analysis model as I think it is clearer and more accurate depending on whether the model simply records requirements or represents some kind of business analysis. However, I find physical model to be vague and misleading. Do you mean implementation model, or do you mean the actual implementation syntax, or? In what sense is the physical model physical?

"Laconic2" <laconic2_at_comcast.net> wrote in message news:reednQMCbKLdkund4p2dnA_at_comcast.com...
> Just a terminology question, I can point it out without making a mountain
> out of a mole hill.
>
> I've always seen the "ER" model listed as the "conceptual model" rather
> than the "logical model".
>
> In this framework, you first turn the ER conceptual model into a
relational
> logical model, and then turn the logical model into a physical model.
>
> It's an extra step, but I think it buys you something.
>
> Again, I don't want to make a mountain out of a mole hill. The rows by
any
> other name would smell as sweet.
>
>
Received on Wed Apr 07 2004 - 10:51:40 CDT

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