给定日期范围内的每日活跃用户数

Question

我需要根据开始日期和结束日期查找活跃用户的每日总计数。

注册表

id  registration_no  start_date  end_date
1   1000             2014/12/01  2014/12/03
2   1001             2014/12/01  2014/12/03
3   1002             2014/12/02  2014/12/04
4   1003             2014/12/02  2014/12/04
5   1004             2014/12/02  2014/12/04
6   1005             2014/12/03  2014/12/05
7   1006             2014/12/05  2014/12/06
8   1007             2014/12/05  2014/12/09
9   1008             2014/12/06  2014/12/10
10  1009             2014/12/07  2014/12/11

结果应为以下格式。

Date        Active Users
2014-12-01  2
2014-12-02  5
2014-12-03  6
2014-12-04  4
2014-12-05  3
2014-12-06  3
2014-12-07  3
2014-12-08  3
2014-12-09  3
2014-12-10  2
2014-12-11  1
2014-12-12  0

我知道以下查询不起作用。

SELECT start_date, count(*) FROM registration
WHERE start_date >= '2014/12/01' AND end_date <='2014/12/12'
GROUP BY start_date

这不是想要的输出：

2014-12-01 2 
2014-12-02 3 
2014-12-03 1 
2014-12-05 2 
2014-12-06 1 
2014-12-07 1

如有任何帮助，我们将不胜感激。

Answer 1

试一试....请注意 2014 年 12 月 2 日的条件，根据评论

SELECT DATE_FORMAT(start_date,'%Y-%m-%d')as Date, count(*) as ActiveUser FROM registration
WHERE (start_date >= '2014/12/02' AND end_date <='2014/12/02')
GROUP BY start_date

Answer 2

您需要创建一个包含所有所需日期的 "calendar"，然后使用如下查询：

SELECT calDay as `Date`, count(id) as `Active Users`
FROM   (SELECT cast('2014-12-01' + interval `day` day as date) calDay
        FROM   days31
        WHERE  cast('2014-12-01' + interval `day` day as date) < '2014-12-12') calendar
LEFT JOIN registration on (calDay between start_date and end_date)
GROUP BY calDay
ORDER BY calDay;

你可以看到它在这个 fiddle, where days31 is just a view with integers 0-30. This allows the query to work in any calendar up to a period of 31 days. You can add more days to the view or generate them on the fly using cross joins. See http://www.artfulsoftware.com/infotree/qrytip.php?id=95

中工作

给定日期范围内的每日活跃用户数

Daily count of Active Users for a given date range

mysql