| From: | "Robert B(dot) Easter" <reaster(at)comptechnews(dot)com> |
|---|---|
| To: | Chris Bitmead <chris(at)bitmead(dot)com> |
| Cc: | Peter Eisentraut <peter_e(at)gmx(dot)net>, PostgreSQL Development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Thus spoke SQL3 (on OO) |
| Date: | 2000-05-21 14:11:31 |
| Message-ID: | 00052110165805.14806@comptechnews |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
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(at)comptechnews(dot)com
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