说明:一下是自定义7天为一个时间段的分组统计 select datediff(ms_time, '开始时间') div 7 as time , count(*) count,sum(money) money from merchant_statistics WHERE ms_time BETWEEN '2019-02-02' and '2019-03-02' group by (datediff(ms_time, '开始时间') div 7)
//1.将所有区间按左端点从小到大排序 //2.从前往后处理每个区间,判断能否将其放到某个现有的组中 //判断某一组的最后一个区间的右端点是否小于该区间的左端点 //如果大于或等于,就开新组,如果小于,就放到组里去,并更新最后一个区间的右端点 #include <iostream> #include <algorithm> #include <queue> using namespace std; ; int n; struct Range { int l, r; bo
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本文发表于本人博客. 今天接着上次[Hadoop mapreduce自定义排序WritableComparable]文章写,按照顺序那么这次应该是讲解自定义分组如何实现,关于操作顺序在这里不多说了,需要了解的可以看看我在博客园的评论,现在开始. 首先我们查看下Job这个类,发现有setGroupingComparatorClass()这个方法,具体源码如下: /** * Define the comparator that controls which keys are grouped toge