MySQL中的滚动计数

如何解决MySQL中的滚动计数

| 我需要获得以下比率（每日注册计数）/（最近30天每天的滚动注册计数） 每日数字直接

SELECT a.DailySignup
FROM
(
SELECT COUNT(1) AS DailySignup,date
FROM users
WHERE date BETWEEN datestart and dateend
GROUP BY date
) a

但是如何计算最近30天的每一天？我知道我需要再次将它加入同一张桌子，但我似乎无法将其围绕如何使用。 更新 抱歉，我不太清楚。

SIGNUP_COUNT DATE          Rolling_Signup_Count
10           2011-01-01    Sign ups from 2010-12-01 to 2011-01-01
12           2011-01-02    Sign ups from 2010-12-02 to 2011-01-02
4            2011-01-03    Sign ups from 2010-12-03 to 2011-01-03

希望此表有助于说明我的意思是滚动注册计数     

解决方法

        您可以尝试子查询：

SELECT DISTINCT t.date,(SELECT COUNT(*) FROM users u where u.date BETWEEN DATE_ADD(t.date,INTERVAL -30 day) AND t.date) as c 
FROM users t

对于给定的日期t.date，子查询将计算以t.date结尾的30天期间的计数。 编辑：要计算比率（每天登录）/（30天之内登录），您可以尝试

SELECT t.date,count(*)/(SELECT COUNT(*) FROM users u 
       WHERE u.date BETWEEN DATE_ADD(t.date,INTERVAL -30 day) AND t.date) as c 
FROM users t GROUP BY t.date

    ,        您可以按

MONTH(date)

分组以获得每个月的收入，请尝试如下操作：

SELECT a.DailySignup,month AS MONTH(date)
FROM users
INNER JOIN (
    SELECT COUNT(*) AS DailySignup,MONTH(date) AS month
            FROM users
    GROUP BY MONTH(date)
) a ON a.month = month
    GROUP BY month