MySQL 统计过去12个月的数据(包括本月)

2.2 统计某台设备在过去12个月中每个月body_infared大于0的数据之和。

select DATE_FORMAT(t.time,‘%Y-%m‘) month,count(t.id) minute from device_data t
where t.body_infrared>0 and t.device_id=13 
AND  DATE_FORMAT(time,‘%Y-%m‘)>
DATE_FORMAT(date_sub(curdate(), interval 12 month),‘%Y-%m‘)
 group by device_id,month

获取结果：

这时候我们发现，原始数据中只有三个月的数据，还有其它9个月按要求应该是显示为0的。

2.3 用一个笨点的方法获取过去12个月所有的月份。
创建一个查找过去12个月的视图，当然这里你也可以使用存储过程遍历地把12个月插入到一个临时表中，代码会更优雅一点。

CREATE 
    ALGORITHM = UNDEFINED 
    DEFINER = `root`@`%` 
    SQL SECURITY DEFINER
VIEW `past_12_month_view` AS
    SELECT DATE_FORMAT(CURDATE(), ‘%Y-%m‘) AS `month` 
    UNION SELECT DATE_FORMAT((CURDATE() - INTERVAL 1 MONTH), ‘%Y-%m‘) AS `month` 
    UNION SELECT DATE_FORMAT((CURDATE() - INTERVAL 2 MONTH), ‘%Y-%m‘) AS `month` 
    UNION SELECT DATE_FORMAT((CURDATE() - INTERVAL 3 MONTH), ‘%Y-%m‘) AS `month` 
    UNION SELECT DATE_FORMAT((CURDATE() - INTERVAL 4 MONTH), ‘%Y-%m‘) AS `month` 
    UNION SELECT DATE_FORMAT((CURDATE() - INTERVAL 5 MONTH), ‘%Y-%m‘) AS `month` 
    UNION SELECT DATE_FORMAT((CURDATE() - INTERVAL 6 MONTH), ‘%Y-%m‘) AS `month` 
    UNION SELECT DATE_FORMAT((CURDATE() - INTERVAL 7 MONTH), ‘%Y-%m‘) AS `month` 
    UNION SELECT DATE_FORMAT((CURDATE() - INTERVAL 8 MONTH), ‘%Y-%m‘) AS `month` 
    UNION SELECT DATE_FORMAT((CURDATE() - INTERVAL 9 MONTH), ‘%Y-%m‘) AS `month` 
    UNION SELECT DATE_FORMAT((CURDATE() - INTERVAL 10 MONTH), ‘%Y-%m‘) AS `month` 
    UNION SELECT DATE_FORMAT((CURDATE() - INTERVAL 11 MONTH), ‘%Y-%m‘) AS `month`

查看12个月的显示情况：

select t.month from past_12_month_view t group by t.month;

2.4 把2.3的12个月的显示数据与 2.2查询结果关联查询

select v.month,ifnull(b.minute,0)  minute from past_12_month_view v 
left join
(select DATE_FORMAT(t.time,‘%Y-%m‘) month,count(t.id) minute 
from device_data t where 
DATE_FORMAT(t.time,‘%Y-%m‘)>
DATE_FORMAT(date_sub(curdate(), interval 12 month),‘%Y-%m‘)
and t.device_id=(select d.id from device d where d.serial=‘01150100004‘)
group by t.device_id,month)b
on v.month = b.month group by v.month

最后得到我们想要的结果：

MySQL 统计过去12个月的数据(包括本月)

标签：mysql   过去12个月   统计每个月   data   数据