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Re: Entities and relationships

From: Bob Badour <bbadour_at_pei.sympatico.ca>
Date: Fri, 12 Oct 2007 16:33:22 -0300
Message-ID: <470fcbc6$0$14853$9a566e8b@news.aliant.net>


Tegiri Nenashi wrote:

> I never really took any effort to bother to know what these are until
> they got in my way in otherwise fine paper:
> http://arxiv.org/PS_cache/arxiv/pdf/0710/0710.2083v1.pdf
> It defines an entity as a relation (aka table:-) with a single
> noncomposite key, and relationship as a table with composite key. Does
> this definition pretty much exhausts the entity-relationship theory?

Um, no, because an order line item is generally an entity--albeit a weak one. If I recall correctly. Received on Fri Oct 12 2007 - 14:33:22 CDT

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