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	<title>sort - 四号程序员</title>
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		<title>MySQL中，Group By后，取每组的Top N条记录</title>
		<link>https://www.coder4.com/archives/4171</link>
					<comments>https://www.coder4.com/archives/4171#respond</comments>
		
		<dc:creator><![CDATA[coder4]]></dc:creator>
		<pubDate>Tue, 01 Apr 2014 07:35:11 +0000</pubDate>
				<category><![CDATA[数据库技术]]></category>
		<category><![CDATA[By]]></category>
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		<category><![CDATA[MySQL]]></category>
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					<description><![CDATA[转载自：http://www.geeklab.info/2012/11/mysql-how-to-get-top-n-rows-for-each-group/ We have the following table and data: &#160; CREATE TEMPORARY TABLE girls( name text, haircolor text, score INT ); INSERT INTO girls VALUES (&#039;M[......] 继续阅读]]></description>
		
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		<title>升级到JDK 7后，Sort出现兼容性问题的解法。</title>
		<link>https://www.coder4.com/archives/4102</link>
					<comments>https://www.coder4.com/archives/4102#respond</comments>
		
		<dc:creator><![CDATA[coder4]]></dc:creator>
		<pubDate>Wed, 22 Jan 2014 01:52:07 +0000</pubDate>
				<category><![CDATA[大数据技术]]></category>
		<category><![CDATA[7]]></category>
		<category><![CDATA[Hadoop]]></category>
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					<description><![CDATA[在昨天的文章 TimSort in Java 7 中，我们讨论了升级到JDK 7后，Collection的sort方法，出现兼容性问题的原因。 究其根本，还是我们写的compare函数不够严谨。 本文主要针对Hadoop、Hive，从系统的部署、配置层面提出一些解法。 1、Hive 在执行前，指定JVM选项。 set mapreduce.map.java.opts=-Xmx2000m -Djava.util.Arrays.useLegacyMergeSort=true[......] 继续阅读]]></description>
		
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		<title>[转载]TimSort in Java 7</title>
		<link>https://www.coder4.com/archives/4092</link>
					<comments>https://www.coder4.com/archives/4092#comments</comments>
		
		<dc:creator><![CDATA[coder4]]></dc:creator>
		<pubDate>Tue, 21 Jan 2014 01:58:13 +0000</pubDate>
				<category><![CDATA[Java]]></category>
		<category><![CDATA[7]]></category>
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		<category><![CDATA[sort]]></category>
		<category><![CDATA[自定义排序]]></category>
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					<description><![CDATA[转载自：TimSort in Java 7 1. 为什么写这篇文章 这篇文章的根源是在产品中发现了一个诡异的bug：只能在产品环境下重现，在我的本地开发环境无法重现，而双方的代码没有任何区别。最后用remote debug的方法找到异常所在： Exception in thread &#34;main&#34; java.lang.IllegalArgumentException: Comparison method violates its general contrac[......] 继续阅读]]></description>
		
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		<title>Linux Shell sort命令，多域排序的正确用法。。</title>
		<link>https://www.coder4.com/archives/3704</link>
					<comments>https://www.coder4.com/archives/3704#respond</comments>
		
		<dc:creator><![CDATA[coder4]]></dc:creator>
		<pubDate>Tue, 11 Dec 2012 12:19:44 +0000</pubDate>
				<category><![CDATA[Linux]]></category>
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		<category><![CDATA[sort]]></category>
		<category><![CDATA[多个]]></category>
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					<description><![CDATA[之前多少次都是错的。 这才是正确的，假设对列1按照字母序，2按照数值序。 sort -k 1,1 -k2,2n 2014.05.12更新： -g, --general-numeric-sort compare according to general numerical value -n, --numeric-sort compare according to string numerical value 如果数据中有科学计数法，形如"8.0177[......] 继续阅读]]></description>
		
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		<title>Linux sort的四个小技巧</title>
		<link>https://www.coder4.com/archives/2629</link>
					<comments>https://www.coder4.com/archives/2629#respond</comments>
		
		<dc:creator><![CDATA[coder4]]></dc:creator>
		<pubDate>Thu, 10 Nov 2011 06:27:00 +0000</pubDate>
				<category><![CDATA[Linux]]></category>
		<category><![CDATA[sort]]></category>
		<category><![CDATA[列]]></category>
		<category><![CDATA[字典]]></category>
		<category><![CDATA[技巧]]></category>
		<category><![CDATA[指定]]></category>
		<category><![CDATA[排序]]></category>
		<category><![CDATA[数字]]></category>
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					<description><![CDATA[像排序这种事情，用C/C++可以写，但很麻烦，交给sort就好了，功能很强大的。 1、按照多个列排序（列间空格分开）： 测试数据： 先按照第1列排序，再第2列的命令： 2011-11-20补充：必须加-s选项，表示stable sort，即两列排序互相不打扰。 $ cat ./test 1       x 5       8 1       a $ sort -s -k 1 -k 2 ./test 1       a 1       x 5      [......] 继续阅读]]></description>
		
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