Re: Is Inheritance in RM possible?

From: Alfredo Novoa <alfredo_novoa_at_hotmail.com>
Date: 15 Dec 2005 04:09:27 -0800
Message-ID: <1134648566.976680.316360@f14g2000cwb.googlegroups.com>

>Does inheritance currently exist in RMDBMS anyhwere? I'm not referring
>here to OO or O-R databases, but rather the addition of the
>functionality in an RM system. Is it even possible or at odds to the
>underlying principles of the model?

It depends on what inheritance means. Inheritance is a fuzzy concept and there are many kinds of inheritance.

>I have heard mention of the INHERITS keyword in Oracle and PostreSQL

This is a bizarre inheritance form :-)

>I've also encountered Darwen's proposal for an inheritance model via a
>google seach, and a trawl to thethirdmanifesto.com, but outside that I
>am need of illumination.

This is about subtyping in the scalar type system.

What problem do you have with this?

Regards
Alfredo Received on Thu Dec 15 2005 - 06:09:27 CST