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	<title>The Pythian Blog &#187; not exists</title>
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		<title>Oracle: Is OUTER JOIN Better Than NOT EXISTS?</title>
		<link>http://www.pythian.com/news/765/oracle-is-outer-join-better-than-not-exists/</link>
		<comments>http://www.pythian.com/news/765/oracle-is-outer-join-better-than-not-exists/#comments</comments>
		<pubDate>Mon, 07 Jan 2008 20:27:29 +0000</pubDate>
		<dc:creator>Grégory Guillou</dc:creator>
				<category><![CDATA[Group Blog Posts]]></category>
		<category><![CDATA[Oracle]]></category>
		<category><![CDATA[10053]]></category>
		<category><![CDATA[not exists]]></category>
		<category><![CDATA[outer join]]></category>

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		<description><![CDATA[I&#8217;ve been told that using NOT EXISTS in (Oracle) SQL is a bad idea, and that a way to overcome this problem is to collect the non-matching rows with an OUTER JOIN. So I decided to check if it is true. In order to start, here is my test case: create table t1(id number, constraint [...]]]></description>
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