sql判断某一列，加载列的和

Question

问题遇到的现象和发生背景

问题相关代码，请勿粘贴截图

       sum(case when D.RQ BETWEEN '2022-01-01' and '2022-01-31' then d.ryou end) LZY1, 
       sum(case when D.RQ BETWEEN '2022-01-01' and '2022-02-28' then d.ryou end) LZY2, 
       sum(case when D.RQ BETWEEN '2022-01-01' and '2022-03-31' then d.ryou end) LZY3, 
       sum(case when D.RQ BETWEEN '2022-01-01' and '2022-04-30' then d.ryou end) LZY4, 
       sum(case when D.RQ BETWEEN '2022-01-01' and '2022-05-31' then d.ryou end) LZY5, 
       sum(case when D.RQ BETWEEN '2022-01-01' and '2022-06-30' then d.ryou end) LZY6, 
       sum(case when D.RQ BETWEEN '2022-01-01' and '2022-07-31' then d.ryou end) LZY7, 
       sum(case when D.RQ BETWEEN '2022-01-01' and '2022-08-31' then d.ryou end) LZY8, 
       sum(case when D.RQ BETWEEN '2022-01-01' and '2022-09-30' then d.ryou end) LZY9, 
       sum(case when D.RQ BETWEEN '2022-01-01' and '2022-10-31' then d.ryou end) LZY10, 
       sum(case when D.RQ BETWEEN '2022-01-01' and '2022-11-30' then d.ryou end) LZY11, 
       sum(case when D.RQ BETWEEN '2022-01-01' and '2022-12-31' then d.ryou end) LZY12

运行结果及报错内容

我的解答思路和尝试过的方法

想用判断每月最后一天D.DYM的值是否为空来判断，应该是判断有一点问题

sum(case when D.RQ BETWEEN '2022-01-01'  and (case when((case when year(D.RQ) =2022 and month(D.RQ) = 1  then D.DYM end)) is null then null else '2022-01-31' end)then d.ryou end) LZY1,
sum(case when D.RQ BETWEEN '2022-01-01'  and (case when((case when year(D.RQ) =2022 and month(D.RQ) = 2  then D.DYM end)) is null then null else '2022-02-28' end)then d.ryou end) LZY2,
sum(case when D.RQ BETWEEN '2022-01-01'  and (case when((case when year(D.RQ) =2022 and month(D.RQ) = 3 then D.DYM end)) is null then null else '2022-03-31' end)then d.ryou end) LZY3,
sum(case when D.RQ BETWEEN '2022-01-01'  and (case when((case when year(D.RQ) =2022 and month(D.RQ) = 4 then D.DYM end)) is null then null else '2022-04-30' end)then d.ryou end) LZY4,
sum(case when D.RQ BETWEEN '2022-01-01'  and (case when((case when year(D.RQ) =2022 and month(D.RQ) = 5 then D.DYM end)) is null then null else '2022-05-31' end) then d.ryou end) LZY5,
sum(case when D.RQ BETWEEN '2022-01-01'  and (case when((case when year(D.RQ) =2022 and month(D.RQ) = 6 then D.DYM end)) is null then null else '2022-06-30' end) then d.ryou end) LZY6,
sum(case when D.RQ BETWEEN '2022-01-01'  and (case when((case when year(D.RQ) =2022 and month(D.RQ) = 7 then D.DYM end)) is null then null else '2022-07-31' end) then d.ryou end) LZY7,
sum(case when D.RQ BETWEEN '2022-01-01'  and (case when((case when year(D.RQ) =2022 and month(D.RQ) = 8 then D.DYM end)) is null then null else '2022-08-31' end) then d.ryou end) LZY8,
sum(case when D.RQ BETWEEN '2022-01-01'  and (case when((case when year(D.RQ) =2022 and month(D.RQ) = 9  then D.DYM end)) is null then null else '2022-09-30' end) then d.ryou end) LZY9,
sum(case when D.RQ BETWEEN '2022-01-01'  and (case when((case when year(D.RQ) =2022 and month(D.RQ) = 10  then D.DYM end)) is null then null else '2022-10-31' end) then d.ryou end) LZY10,
sum(case when D.RQ BETWEEN '2022-01-01'  and (case when((case when year(D.RQ) =2022 and month(D.RQ) = 11 then D.DYM end)) is null then null else '2022-11-30' end) then d.ryou end) LZY11,
sum(case when D.RQ BETWEEN '2022-01-01'  and (case when((case when year(D.RQ) =2022 and month(D.RQ) = 12 then D.DYM end)) is null then null else '2022-12-31' end) then d.ryou end) LZY12

我想要达到的结果

Answer 1

case when要在分组求和之前做，像这样
select month,sum(RQ) from (
select month,(case when D.RQ BETWEEN '2022-01-01' and '2022-01-31' then d.ryou end) as RQ from test
) tmp group by month

Answer 2

说说看用的是什么数据库,不同数据库的写法不一样。
这个思路其实可以这样,先简单做每个月的月汇总,竖着的,然后使用开窗函数的移动窗口,从第一行到当前行累加,最后再做个行列转换就行了,
这样代码量比你目前的代码量少得多,而且可以达到你想要的效果

Answer 3

https://ask.csdn.net/questions/337731?spm=1005.2026.3001.5635&utm_medium=distribute.pc_relevant_ask_down.none-task-ask-2~default~OPENSEARCH~Rate-15.pc_feed_download_top3ask&depth_1-utm_source=distribute.pc_relevant_ask_down.none-task-ask-2~default~OPENSEARCH~Rate-15.pc_feed_download_top3ask