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Re: Foreign key problem

From: x <x_at_not-exists.org>
Date: Wed, 14 Jun 2006 12:31:36 +0300
Message-ID: <e6omj0$9nl$1@nntp.aioe.org>

"Erwin" <e.smout_at_myonline.be> wrote in message news:1150273095.922557.173400_at_u72g2000cwu.googlegroups.com...
> > 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 - 04:31:36 CDT

Original text of this message

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