| From: | Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com> |
|---|---|
| To: | Igor Neyman <ineyman(at)perceptron(dot)com> |
| Cc: | Chris(dot)Ellis(at)shropshire(dot)gov(dot)uk, neilstylz(at)yahoo(dot)com, pgsql-general(at)postgresql(dot)org |
| Subject: | Re: combine SQL SELECT statements into one |
| Date: | 2010-02-01 20:25:41 |
| Message-ID: | dcc563d11002011225p80b1af7ta400155584e1f1fb@mail.gmail.com |
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| Lists: | pgsql-general pgsql-novice pgsql-sql |
On Mon, Feb 1, 2010 at 12:09 PM, Igor Neyman <ineyman(at)perceptron(dot)com> wrote:
> Original poster asked for the sql that will touch inventory table only
> once.
>
> Your statement (with 3 subqueries) will do it 3 times.
I'm pretty sure that starting with 8.3 the engine will collapse all
those into one seq scan internally.
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