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用oracle语句计算百分比

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Jun 07, 2016 pm 02:50 PM

oraclecompanypercentagefirst daycalculatestatement

来公司第一天，也没什么事干，经理说今天需要把报表做出来，需要写几个oracle语句，用来查询各类别下的人员数量和占总人数比例。如下图统计人数到不是问题，关键是比例不知道该怎么去做，上网查了好几个方式都尝试过了，但还是没能弄出来，一下午的时间

来公司第一天，也没什么事干，经理说今天需要把报表做出来，需要写几个oracle语句，用来查询各类别下的人

员数量和占总人数比例。如下图

统计人数到不是问题，关键是比例不知道该怎么去做，上网查了好几个方式都尝试过了，但还是没能弄出来，一

下午的时间全花在解决这个问题上了，最后在要下班的时候，我突然看到了oracle中聚合函数sum() over的使用，最

终使得问题得到了解决。

实现代码：

SELECT(CASE WHEN db_psndoc.age30 THEN '30岁及以下' END)
ranges, COUNT(*) rs ,100*round(COUNT(*)/SUM(COUNT(*)) OVER(),4)||'%' percent FROM bd_psnd
GROUP BY CASE
WHEN bd_psndoc.age
<p><span style="font-size:18px"><strong></strong></span> </p>
<p><span style="font-size:18px"><strong>结果展示：</strong></span></p>
<p><img src="/static/imghwm/default1.png" data-src="http://img.blog.csdn.net/20160508223110629?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" class="lazy" alt=""></p>
<p> </p>
<p> </p>
<p> </p>
<p><span style="font-size:18px">SUM() OVER用法：</span></p>
<p><span style="font-size:18px">参考链接：http://www.2cto.com/database/201209/157605.html</span></p>
<p><span style="font-size:18px"></span> </p>
<p><span style="font-size:18px"><strong>总结：</strong></span></p>
<p><span style="font-size:18px">1、要学习的东西还有很多，知道什么有用很重要。</span></p>
<p><span style="font-size:18px">2、基础知识很重要，能用已知的探索未知的。</span></p>
<p> </p>
<p><span style="font-size:18px"></span> </p>
<p><span style="font-size:18px"></span> </p>
<p><span style="font-size:18px"></span> </p>
<p><span style="font-size:18px"></span> </p>
<p> </p>

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