Re: [PROPOSAL] Covering + unique indexes.
От | Vik Fearing |
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Тема | Re: [PROPOSAL] Covering + unique indexes. |
Дата | |
Msg-id | 55F7E0AB.3020600@2ndquadrant.fr обсуждение исходный текст |
Ответ на | Re: [PROPOSAL] Covering + unique indexes. (David Rowley <david.rowley@2ndquadrant.com>) |
Ответы |
Re: [PROPOSAL] Covering + unique indexes.
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Список | pgsql-hackers |
On 09/15/2015 10:57 AM, David Rowley wrote: >> I agree, that form >> > CREATE UNIQUE INDEX i ON t (f1, f2, f3) INCLUDE (f4) >> > is clear. f4 will be used in row compare and actually planner will be able >> > to use it as unique index (f1, f2, f3) with additional f4 or as >> > as unique index (f1, f2, f3, f4), because uniqueness on (f1, f2, f3) gives >> > warranty of uniqueness on (f1, f2, f3, f4) >> > >> > > I'd vote for this too. However, INCLUDE does not seem to be a reserved word > at the moment. What about CREATE UNIQUE INDEX i ON t (f1, f2, f3) WITH (f4); ? -- Vik Fearing +33 6 46 75 15 36 http://2ndQuadrant.fr PostgreSQL : Expertise, Formation et Support
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