Re: One-To-One Relationships
Date: Fri, 30 Nov 2007 11:50:40 -0800 (PST)
On 30 nov, 19:03, Tegiri Nenashi <TegiriNena..._at_gmail.com> wrote:
> On Nov 30, 8:19 am, Jan Hidders <hidd..._at_gmail.com> 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,
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: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?
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