Re: Thus spoke SQL3 (on OO)
От | Robert B. Easter |
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Тема | Re: Thus spoke SQL3 (on OO) |
Дата | |
Msg-id | 00052110165805.14806@comptechnews обсуждение исходный текст |
Ответ на | Re: Thus spoke SQL3 (on OO) (Chris Bitmead <chris@bitmead.com>) |
Список | 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@comptechnews.com
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