Re: "Number of columns exceed limit" on a hierarchy of views

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От Alvaro Herrera
Тема Re: "Number of columns exceed limit" on a hierarchy of views
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Msg-id 20090821190002.GJ5487@alvh.no-ip.org
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Ответ на Re: "Number of columns exceed limit" on a hierarchy of views  (Eric Schwarzenbach <subscriber@blackbrook.org>)
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Eric Schwarzenbach wrote:

> In other words, if you have
>
> create view C select * from A join B on (A.foo = B.foo);
> create view D select * from C join E on (C.foo= E.foo);
> and you execute some select query on D, does it necessarily join A and B
> before joining the result to E, or might it decide to join B with E
> first before joining the result to A?

It may switch join order, yes.

--
Alvaro Herrera                                http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.

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