From: Tom Lane <tgl@sss.pgh.pa.us>
To: Linos <info@linos.es>
Cc: pgsql-performance@postgresql.org
Subject: Re: CTE vs Subquery
Date: Tue, 25 Oct 2011 12:43:45 -0400
Message-ID: <24672.1319561025@sss.pgh.pa.us> (raw)
In-Reply-To: <4EA6E252.6030002@linos.es>
References: <4EA6E252.6030002@linos.es>
Linos <info@linos.es> writes:
> i am having any problems with performance of queries that uses CTE, can the
> join on a CTE use the index of the original table?
CTEs act as optimization fences. This is a feature, not a bug. Use
them when you want to isolate the evaluation of a subquery.
regards, tom lane
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To: pgsql-performance@postgresql.org
Cc: tgl@sss.pgh.pa.us, info@linos.es
Subject: Re: CTE vs Subquery
In-Reply-To: <24672.1319561025@sss.pgh.pa.us>
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