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	<title>《奇怪的SQL》的评论</title>
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		<title>作者：D瓜哥</title>
		<link>https://wordpress.diguage.com/archives/30.html#comment-13</link>
		<dc:creator>D瓜哥</dc:creator>
		<pubDate>Tue, 24 Jul 2012 07:17:04 +0000</pubDate>
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		<description>谢谢！有机会我查看一下Oracle的解析计划，再重新炒炒。哈哈</description>
		<content:encoded><![CDATA[<p>谢谢！有机会我查看一下Oracle的解析计划，再重新炒炒。哈哈</p>
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		<title>作者：jsper</title>
		<link>https://wordpress.diguage.com/archives/30.html#comment-12</link>
		<dc:creator>jsper</dc:creator>
		<pubDate>Tue, 24 Jul 2012 05:54:10 +0000</pubDate>
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		<description>not in 内外表都要全表扫描

not exists 内表使用联接方式 内层表子查询可以走索引</description>
		<content:encoded><![CDATA[<p>not in 内外表都要全表扫描</p>
<p>not exists 内表使用联接方式 内层表子查询可以走索引</p>
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