MySQL实现按天统计数据的方法

一、首先生成一个日期表，执行SQL如下：

CREATE TABLE num (i int);
INSERT INTO num (i) VALUES (0), (1), (2), (3), (4), (5), (6), (7), (8), (9);
CREATE TABLE  if not exists calendar(datelist date);  INSERT INTO calendar(datelist) SELECT
    adddate(
        (
            DATE_FORMAT("2019-1-1", '%Y-%m-%d')
        ),
        numlist.id
    ) AS `date`
FROM
    (
        SELECT
            n1.i + n10.i * 10 + n100.i * 100 + n1000.i * 1000+ n10000.i * 10000 AS id
        FROM
            num n1
        CROSS JOIN num AS n10
        CROSS JOIN num AS n100
        CROSS JOIN num AS n1000
        CROSS JOIN num AS n10000
    ) AS numlist;

二、按天统计所需数据SQL如下：

SELECT
    date(dday) ddate,
    max(registerNum) as registerNum,
    max(rechargeNum) as rechargeNum,
    max(rechargeTotal) as rechargeTotal
FROM
    (
        SELECT
            datelist as dday,0 as registerNum,0 as rechargeNum,0 as rechargeTotal
        FROM
            calendar
            WHERE  1  AND DATE_SUB(CURDATE(), INTERVAL 365 DAY) <= date(datelist)&&date(datelist)<=CURDATE()
        UNION ALL
            SELECT  FROM_UNIXTIME(a.time,"%Y-%m-%d") as dday, 0 as registerNum,count(DISTINCT(a.user_id)) as rechargeNum,sum(a.money) as rechargeTotal FROM
               top_up AS a LEFT  JOIN referee AS b ON a.user_id=b.referee_id
               LEFT JOIN channel_user AS c ON b.user_id = c.uid WHERE 1  AND c.uid=1087 AND a.status=2
               GROUP BY dday
         UNION ALL
            SELECT  FROM_UNIXTIME(a.time,"%Y-%m-%d") as dday, count(a.referee_id) as registerNum,0 as rechargeNum,0 as rechargeTotal FROM
               referee AS a
               LEFT JOIN channel_user AS b ON a.user_id = b.uid WHERE 1  AND b.uid=1087
               GROUP BY dday
    ) a
GROUP BY ddate
ORDER BY ddate DESC LIMIT 0,10

以上统计数据可根据自身统计需求修改。

三、执行效果如下图：