我的数据从2008年1月1日到今天按日期排列在表比率的第一列.
我在第二栏中有值.我能够使用以下代码执行累积的第三列,但我不知道如何使其每年1月1日重新开始,每年累计.
SELECT
t3.Date,
SUM(cumul) AS cumul
FROM (
SELECT
t1.Date,
t1.nb,
SUM(t2.nb) AS cumul
FROM (
SELECT
Ratio.Date,
SUM(DailyValue) AS Nb
FROM Ratio
GROUP BY Ratio.Date
)t1
INNER JOIN (
SELECT
Ratio.Date,
SUM(DailyValue) AS nb
FROM Ratio
GROUP BY Ratio.Date
) t2
ON t1.Date >= t2.Date
GROUP BY t1.Date, t1.nb
)t3
GROUP BY PnLDate,nb
ORDER BY pnldate
最佳答案 使用窗口函数SUM有一种更好的方法
select Date,
sum(sum(DailyValue)) over (
partition by year(date) order by date
) as cumul
from Ratio
group by Date
order by Date;