From: andrew <andrew.ylzhou@gmail.com>
To: pgsql-sql@postgresql.org
Subject: Re: filtering after join
Date: Thu, 26 Jan 2006 13:54:23 +0100
Message-ID: <29d3b0b90601260454g35817213o7d5a0e8a1e53ddf7@mail.gmail.com> (raw)
In-Reply-To: <200601261222.34906.peter_e@gmx.net>
References: <29d3b0b90601250927o2a5ee6e6mc33a7647da4438ce@mail.gmail.com>
<200601261127.05442.peter_e@gmx.net>
<29d3b0b90601260254n10d2c9aby77651744337020f8@mail.gmail.com>
<200601261222.34906.peter_e@gmx.net>
How will the query planner do for a nesting query? Treat the
subqueries as multiple queries and then link them together?
where can I find the information (codes or documents)?
Thanks.
On 1/26/06, Peter Eisentraut <peter_e@gmx.net> wrote:
> andrew wrote:
> > But the function foo() would produce different values for the two
> > queries, so the result will be different.
> > A simple example is foo() computes the sum of all the integer fields
> > of the input record.
>
> OK, I see now where you're getting at. You want to combine the record
> type of A and B into one. Then the proposed solution is right.
>
> --
> Peter Eisentraut
> http://developer.postgresql.org/~petere/
>
--
andrew
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To: pgsql-sql@postgresql.org
Cc: andrew.ylzhou@gmail.com
Subject: Re: filtering after join
In-Reply-To: <29d3b0b90601260454g35817213o7d5a0e8a1e53ddf7@mail.gmail.com>
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