Re: Is Inheritance in RM possible?
Date: 15 Dec 2005 04:09:27 -0800
Message-ID: <1134648566.976680.316360_at_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 - 13:09:27 CET