From: Tom Lane <tgl@sss.pgh.pa.us>
To: Michal Taborsky - Internet Mall <michal.taborsky@mall.cz>
Cc: pgsql-performance@postgresql.org
Subject: Re: 3-table query optimization
Date: Wed, 09 Aug 2006 11:08:59 -0400
Message-ID: <20367.1155136139@sss.pgh.pa.us> (raw)
In-Reply-To: <44D9EBEB.9010704@mall.cz>
References: <44D9EBEB.9010704@mall.cz>
Michal Taborsky - Internet Mall <michal.taborsky@mall.cz> writes:
> SELECT product.product_id
> FROM action
> JOIN product ON (product.product_id=action.product_id)
> WHERE action.shop_group_id=1
> AND EXISTS (SELECT 1
> FROM catalog.product_program
> WHERE product_id=product.product_id
> AND product_program.program_id =1104322
> )
Try converting the EXISTS subquery to an IN.
regards, tom lane
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To: pgsql-performance@postgresql.org
Cc: tgl@sss.pgh.pa.us, michal.taborsky@mall.cz
Subject: Re: 3-table query optimization
In-Reply-To: <20367.1155136139@sss.pgh.pa.us>
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