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	<title>benlumley.co.uk &#187; performance</title>
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		<title>MySQL Query Optimiser Left Lacking &#8230;..</title>
		<link>http://benlumley.co.uk/2008/06/25/mysql-query-optimiser-left-lacking</link>
		<comments>http://benlumley.co.uk/2008/06/25/mysql-query-optimiser-left-lacking#comments</comments>
		<pubDate>Wed, 25 Jun 2008 08:04:46 +0000</pubDate>
		<dc:creator>ben</dc:creator>
				<category><![CDATA[Web Dev]]></category>
		<category><![CDATA[mysql]]></category>
		<category><![CDATA[optimisation]]></category>
		<category><![CDATA[performance]]></category>

		<guid isPermaLink="false">http://www.benlumley.co.uk/2008/06/25/mysql-query-optimiser-left-lacking/</guid>
		<description><![CDATA[I was looking at ways to squeeze a bit more performance out of a query yesterday, and came accross this:
http://www.mysqlperformanceblog.com/2007/04/06/using-delayed-join-to-optimize-count-and-limit-queries/
Take this example (structure doesn&#8217;t really matter):
SELECT *
FROM table1
LEFT JOIN table2 ON table1.fk=table2.pk
LEFT JOIN table3 ON table1.fk2=table3.id
WHERE table1.field=&#8217;123&#8242; &#124;
ORDER BY table1.field2
LIMIT 20, 30
If you&#8217;ve got a lot of joined records in table2 or 3, then the [...]]]></description>
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