Re: Very specialised query

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От Matthew Wakeling
Тема Re: Very specialised query
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Msg-id alpine.DEB.2.00.0903301657300.21772@aragorn.flymine.org
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Ответ на Re: Very specialised query  ("Marc Mamin")
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On Mon, 30 Mar 2009, Marc Mamin wrote:
> But I often read that BETWEEN is faster than using 2 comparison operators.

http://www.postgresql.org/docs/current/static/functions-comparison.html
says otherwise.

> a BETWEEN x AND y
>
> is equivalent to
>
> a >= x AND a <= y
>
> There is no difference between the two respective forms apart from the
> CPU cycles required to rewrite the first one into the second one
> internally.

Matthew

--
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 in Australia.

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