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	<title>select * from depesz; &#187; null</title>
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		<title>NULLs vs. NOT IN()</title>
		<link>http://www.depesz.com/index.php/2008/08/13/nulls-vs-not-in/</link>
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		<pubDate>Wed, 13 Aug 2008 08:58:59 +0000</pubDate>
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				<category><![CDATA[Uncategorized]]></category>
		<category><![CDATA[not in]]></category>
		<category><![CDATA[null]]></category>
		<category><![CDATA[postgresql]]></category>

		<guid isPermaLink="false">http://www.depesz.com/?p=1246</guid>
		<description><![CDATA[Friend of mine found something that he thought looked like a bug in Pg. Very simple query: select * from table where id not in (select field from other_table) was not returning any rows, despite the fact that there definitely are some &#8220;ids&#8221; that are not in other_table.field. Why is that? First, let&#8217;s build a [...]]]></description>
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