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	<title>select * from depesz; &#187; conditions</title>
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		<title>Waiting for 8.5 &#8211; conditional triggers</title>
		<link>http://www.depesz.com/2009/12/23/waiting-for-8-5-conditional-triggers/</link>
		<comments>http://www.depesz.com/2009/12/23/waiting-for-8-5-conditional-triggers/#comments</comments>
		<pubDate>Wed, 23 Dec 2009 02:50:19 +0000</pubDate>
		<dc:creator>depesz</dc:creator>
				<category><![CDATA[Uncategorized]]></category>
		<category><![CDATA[cond]]></category>
		<category><![CDATA[conditional]]></category>
		<category><![CDATA[conditions]]></category>
		<category><![CDATA[constraint]]></category>
		<category><![CDATA[deferrable]]></category>
		<category><![CDATA[deferred]]></category>
		<category><![CDATA[pg85]]></category>
		<category><![CDATA[pg90]]></category>
		<category><![CDATA[postgresql]]></category>
		<category><![CDATA[triggers]]></category>

		<guid isPermaLink="false">http://www.depesz.com/?p=1555</guid>
		<description><![CDATA[On 20th of November Tom Lane committed patch by Takahiro Itagaki which adds interesting functionality: Add a WHEN clause to CREATE TRIGGER, allowing a boolean expression to be checked to determine whether the trigger should be fired. &#160; For BEFORE triggers this is mostly a matter of spec compliance; but for AFTER triggers it can [...]]]></description>
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		<title>Conditional DDL?</title>
		<link>http://www.depesz.com/2008/06/18/conditional-ddl/</link>
		<comments>http://www.depesz.com/2008/06/18/conditional-ddl/#comments</comments>
		<pubDate>Wed, 18 Jun 2008 12:53:23 +0000</pubDate>
		<dc:creator>depesz</dc:creator>
				<category><![CDATA[Uncategorized]]></category>
		<category><![CDATA[conditions]]></category>
		<category><![CDATA[ddl]]></category>
		<category><![CDATA[functions]]></category>
		<category><![CDATA[plpgsql]]></category>
		<category><![CDATA[postgresql]]></category>
		<category><![CDATA[sql]]></category>

		<guid isPermaLink="false">http://www.depesz.com/?p=1217</guid>
		<description><![CDATA[Every now and then I see people ask the question &#8211; how to create table if it doesn&#8217;t exist yet, how to drop it, but only if it does exist and so on. Well, starting from 8.2 dropping should be not a problem anymore. But what about create? Alter? Let&#8217;s try to do it&#8230; First [...]]]></description>
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