Re: Foreign key problem

From: x <>
Date: Wed, 14 Jun 2006 12:31:36 +0300
Message-ID: <e6omj0$9nl$>

"Erwin" <> wrote in message
> > At the end of the day, foreign keys is an implementation issue. But Ted
> > Codd had a lot to say about the domain of foreign keys. The "glue".

> ???????

Codd's 1990 book about RM/V2.

> Foreign keys (or better : the referential integrity rules that embody
> FKs) are an implementation issue to those writing DBMS's. They are
> very much a model issue to those writing applications that use a DBMS.

> So whether or not they are an implementation issue does not depend on
> the hour of the day.

> Date and Darwen still have a lot to say about foreign keys, and since
> that is based on over thirty years of additional research

In what academic journals their works is published ?

>and the
> corresponding increased insights in the matter, their writings are now
> far more relevant than are Codd's.

> Incidentally : they have absolutely
> *nothing* to say about *the domain* of foreign keys, because they have
> nothing to say about the domain of attributes in general.

That's funny. Received on Wed Jun 14 2006 - 11:31:36 CEST

Original text of this message