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	<title>Oracle &#8211; 随手笔记</title>
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		<title>Oracle 锁表解除</title>
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		<dc:creator><![CDATA[Hana]]></dc:creator>
		<pubDate>Mon, 16 Oct 2017 07:13:23 +0000</pubDate>
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					<description><![CDATA[首先执行下面的查询语句，查询出锁表信息。 select * from v$session t1 inner j [&#8230;]]]></description>
		
		
		
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		<title>Oracle数据库的内置定时任务</title>
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		<pubDate>Thu, 28 Sep 2017 02:43:28 +0000</pubDate>
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					<description><![CDATA[想要使用Oracle自带的定时计划，来固定每过一段时间执行一次固定的SQL语句，按照如下操作进行设置。 1.  [&#8230;]]]></description>
		
		
		
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		<title>Oracle 查询时将结果为负数的转换为0  取最大值、最小值[Greatest、least]函数</title>
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		<pubDate>Fri, 18 Aug 2017 02:05:14 +0000</pubDate>
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					<description><![CDATA[我们在做数据库统计时往往会遇到查询列是计算出来的，例如查询两公司销售差额等。最近有一个这样的需求：将计算后的结 [&#8230;]]]></description>
		
		
		
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		<title>Oracle 错误 ORA-01450:超出最大的关键字长度(6398)</title>
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					<description><![CDATA[有时我们在【创建数据表】时、【创建物化视图】时、亦或者在【给数据表创建索引】时，提示这个错误： ORA-014 [&#8230;]]]></description>
		
		
		
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		<title>Oracle SQL语句去重查询、整理数据</title>
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		<pubDate>Tue, 22 Nov 2016 07:53:37 +0000</pubDate>
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					<description><![CDATA[Oracle等数据库在查询时去除重复结果的关键字是distinct，使用例子：select distinct  [&#8230;]]]></description>
		
		
		
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		<title>Oracle 笔记 DBLINK 查看、创建、删除</title>
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		<pubDate>Thu, 31 Mar 2016 13:42:55 +0000</pubDate>
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					<description><![CDATA[1. 查看当前库拥有的DBLINK 方法1：select owner,object_name from dba [&#8230;]]]></description>
		
		
		
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		<title>Oracle 通过 timestamp 查询一段时间以前的数据</title>
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		<pubDate>Thu, 07 May 2015 02:48:29 +0000</pubDate>
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					<description><![CDATA[用于当错误地更新了数据后，查询出历史数据去恢复错误的数据，非常实用。 例子如下： select * from  [&#8230;]]]></description>
		
		
		
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