查询近7天，近1个月，近3个月每天的数据量，查询近一年每个月的数据量

统计近7天每天，近一个月每天，近三个月每天，近一年每个月的新增数量，用于画折线图，由于是根据create_time字段统计的，所以如果有一天没有新增，就会缺少这一天的日期，要对日期进行补充，当天没有新增的new_count置为0，所以要建立一个日期表calendar

1、查询单表account，近7天每天新增的数量

SELECT
IFNULL(COUNT(a.create_time), 0) AS new_count,
DATE_FORMAT(c.datelist, '%Y-%m-%d') AS show_time 
FROM
account a
RIGHT JOIN calendar c ON DATE_FORMAT(c.datelist, '%Y-%m-%d') = DATE_FORMAT(a.create_time, '%Y-%m-%d')  WHERE c.datelist < CURDATE()
AND c.datelist >= DATE_SUB(CURDATE(), INTERVAL 7 DAY)
GROUP BY
show_time
ORDER BY
show_time ASC;

2、查询单表account近一个月每天、近三个月每天的数据量写法同上

3、查询近一年每个月的数据量

SELECT
    IFNULL(count(a.create_time), 0) AS new_count,
    DATE_FORMAT(c.datelist, '%Y-%m') AS show_time
FROM
    account a
RIGHT JOIN calendar c ON DATE_FORMAT(c.datelist, '%Y-%m-%d') = DATE_FORMAT(a.create_time, '%Y-%m-%d')
WHERE
    c.datelist < CURDATE()
AND c.datelist >= DATE_SUB(CURDATE(), INTERVAL 1 YEAR)
GROUP BY
    show_time
ORDER BY
    show_time ASC;

4、查询近7天，account表字段为reward符合日期查询条件的total reward

SELECT
IFNULL(SUM(reward), 0) AS reward,
DATE_FORMAT(c.datelist, '%Y-%m-%d') AS show_time
FROM
account a
RIGHT JOIN calendar c ON DATE_FORMAT(c.datelist, '%Y-%m-%d') = DATE_FORMAT(a.create_time, '%Y-%m-%d')
WHERE
c.datelist < CURDATE()
AND c.datelist >= DATE_SUB(CURDATE(), INTERVAL 7 DAY)
GROUP BY
show_time
ORDER BY
show_time ASC;

(查询近一个月每天，近三个月每天的total reward同上)

5、查询近一年每个月的total reward

SELECT
IFNULL(SUM(reward), 0) AS reward,
DATE_FORMAT(c.datelist, '%Y-%m') AS show_time
FROM
account a
RIGHT JOIN calendar c ON DATE_FORMAT(c.datelist, '%Y-%m-%d') = DATE_FORMAT(a.create_time, '%Y-%m-%d')
WHERE
c.datelist < CURDATE()
AND c.datelist >= DATE_SUB(CURDATE(), INTERVAL 1 YEAR)
GROUP BY
show_time
ORDER BY
show_time ASC;
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原文链接：https://blog.csdn.net/y_1111/article/details/78971291