MySQL的累计金额和按年分组

Question

我如何才能使mysql列和按月分组的累积总和在这里是我的表“保存”

id date         value
1  01/01/2018   10
2  01/12/2018   5
3  02/03/2018   6
4  02/23/2018   4

我尝试这个查询

SET @SumVariable:=0;
select CONCAT(LEFT(monthname(date),3),'-', year(date)) as month
    ,sum(value)
    ,(@SumVariable := @SumVariable + sum(value)) AS total
FROM saving
GROUP BY year(date), month(date) LIMIT 50

查询返回

month      value
jan-2018    15
feb-2018    10

这不是累积的总和，我需要输出如下

month       total
jan-2018    15
feb-2018    25

Answer 1

尝试这个 ：

select date_format(s1.date,'%b-%Y') as month,
       (select sum(s2.value) 
        from saving s2 
        where s2.date <= last_day(s1.date)) as total
from saving s1
group by month
order by s1.date
limit 50;

您可以查看有关此问题的更多信息：

在MySQL中创建累积总和列