From: Robert B. Easter <reaster@comptechnews.com>
To: Chris Bitmead <chris@bitmead.com>
Cc: Peter Eisentraut <peter_e@gmx.net>
Cc: PostgreSQL Development <pgsql-hackers@postgresql.org>
Subject: Re: Thus spoke SQL3 (on OO)
Date: Sun, 21 May 2000 10:11:31 -0400
Message-ID: <00052110165805.14806@comptechnews> (raw)
In-Reply-To: <39286B3F.F4594E40@bitmead.com>
References: <Pine.LNX.4.21.0005201507330.423-100000@localhost.localdomain>
<00052108053904.14806@comptechnews>
<39286B3F.F4594E40@bitmead.com>
On Sun, 21 May 2000, Chris Bitmead wrote:
> "Robert B. Easter" wrote:
>
> > I guess the major difference is that the hierarchial-model does not
> > support multiple inheritance.
>
> I don't agree. From SQL3...
>
> "To avoid name clashes, a subtype can rename selected components of the
> representation inherited from its direct supertypes."
>
> and if that doesn't clinch it...
>
> "Let the term replicated column mean a column appearing in more than one
> direct supertable of T that is inherited by at least one of those direct
> supertables from the same column of a single higher-level supertable."
>
> That sounds like multiple repeated inheritance to me.
>
What is the date on the copy of the SQL/Foundation you are reading? My copy is
dated September 23, 1999 ISO/IEC 9075-2 SQL3_ISO. I tried searching for the
quotes above and could not find them. Do I have the correct version?
--
Robert B. Easter
reaster@comptechnews.com
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To: pgsql-hackers@postgresql.org
Cc: reaster@comptechnews.com, chris@bitmead.com, peter_e@gmx.net
Subject: Re: Thus spoke SQL3 (on OO)
In-Reply-To: <00052110165805.14806@comptechnews>
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