Re: One-To-One Relationships

From: Jan Hidders <>
Date: Fri, 30 Nov 2007 11:50:40 -0800 (PST)
Message-ID: <>

On 30 nov, 19:03, Tegiri Nenashi <> wrote:
> 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?

Not really. In database terms you can define how it is represented, but not what it is that is being represented.

> 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?

Certainly not. Datamining is about finding likely candidates in a quick way. It is not necessarily about being exhaustive or giving a full definition of what you are looking for.

  • Jan Hidders
Received on Fri Nov 30 2007 - 20:50:40 CET

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