From: | Jeff Davis <pgsql(at)j-davis(dot)com> |
---|---|
To: | Lincoln Yeoh <lyeoh(at)pop(dot)jaring(dot)my> |
Cc: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: postgresql table inheritance |
Date: | 2007-11-30 19:30:30 |
Message-ID: | 1196451030.22428.394.camel@dogma.ljc.laika.com |
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Thread: | |
Lists: | pgsql-general |
On Fri, 2007-11-30 at 21:42 +0800, Lincoln Yeoh wrote:
> --- post follows ---
> by Anonymous Coward on Wed Nov 28, '07 03:23 PM (#21509173)
>
> Speak for your database -- postgresql does.
>
> Postgresql's "table inheritance" is a flawed concept and has nothing to do
> with the *type system*. Relations contain tuples, and tuples contain
> attributes, which are a name plus a VALUE. Those values are chosen from TYPES
> (sets of possible values). Those types are the TYPE SYSTEM.
"Foundation for Future Database Systems: The Third Manifesto" by C.J.
Date and Hugh Darwen discusses this topic in Appendix E, and a related
topic in Appendix D.
They also propose, in detail with a lot of analysis, how they think that
type inheritance should work in the set of chapters on the Inheritance
Model, or "IM".
Regards,
Jeff Davis
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