Re: One-To-One Relationships

From: Tegiri Nenashi <>
Date: Fri, 30 Nov 2007 10:03:04 -0800 (PST)
Message-ID: <>

On Nov 30, 8:19 am, Jan Hidders <> wrote: The distinction between entities /
> relationships, domain objects / predicates is pretty well-established
> in linguistics, philosophy and logic.

That certainly means you can define them formally in database terms, right?
Here is one such attempt: 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?

(But then BB remark was that order line is a weak entity). Received on Fri Nov 30 2007 - 19:03:04 CET

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