Re: 8.4 release notes proof reading 1/2
От | Bruce Momjian |
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Тема | Re: 8.4 release notes proof reading 1/2 |
Дата | |
Msg-id | 200903272240.n2RMe0v09811@momjian.us обсуждение исходный текст |
Ответ на | Re: 8.4 release notes proof reading 1/2 (Andrew Gierth <andrew@tao11.riddles.org.uk>) |
Ответы |
Re: 8.4 release notes proof reading 1/2
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Список | pgsql-hackers |
Andrew Gierth wrote: > >>>>> "Guillaume" == Guillaume Smet <guillaume.smet@gmail.com> writes: > > Guillaume> - "While semi-joins merely replace existing IN joins, > Guillaume> anti-joins are a new capability for NOT IN and NOT EXIST > Guillaume> clauses (Tom) This improves optimization possibilities." > Guillaume> -> remove the "(Tom)", s/EXIST/EXISTS/ > > Also s/NOT IN and // (anti-joins are not used for NOT IN due to the > awkward semantics of nulls). Should possibly also mention the fact that > some outer joins can be planned as anti-joins too. Thanks, text updated: While semi-joins merely replace existing IN joins, anti-joins are a new capability for NOT EXISTS clauses (Tom)This improves optimization possibilities. -- Bruce Momjian <bruce@momjian.us> http://momjian.us EnterpriseDB http://enterprisedb.com + If your life is a hard drive, Christ can be your backup. +
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