Cumulative sum reset by change of year (SQL Server) - sql

Question

I'm using SQL Server 2017. I would like to sum up the budget per month of a year for that year and factory.
This cumulation is to be reset with each new year.
Table schema:
CREATE TABLE [TABLE_1]
(
FACTORY varchar(50) Null,
DATE_YM int Null,
BUDGET int NULL,
);
INSERT INTO TABLE_1 (FACTORY, DATE_YM, BUDGET)
VALUES ('A', 202111, 1),
('A', 202112, 1),
('A', 202201, 10),
('A', 202202, 100),
('A', 202203, 1000),
('B', 202111, 2),
('B', 202112, 2),
('B', 202201, 20),
('B', 202202, 200),
('B', 202203, 2000),
('C', 202111, 3),
('C', 202112, 3),
('C', 202201, 30),
('C', 202202, 300),
('C', 202203, 3000);
LINK TO db<>fiddle
Desired result
FACTORY
DATE_YM
C_BUDGET_SUM
A
202111
1
A
202112
2
A
202201
10
A
202202
110
A
202203
1110
B
202111
2
B
202112
4
B
202201
20
B
202202
220
B
202203
2220
C
202111
3
C
202112
6
C
202201
30
C
202202
330
C
202203
3330
My approach:
WITH data AS
(
SELECT
T1.FACTORY,
T1.DATE_YM,
T1.BUDGET
FROM
TABLE_1 AS T1
)
SELECT
FACTORY,
DATE_YM,
SUM(BUDGET) OVER (ORDER BY FACTORY, DATE_YM ASC
ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS 'C_BUDGET_SUM'
FROM
data
This query totals across year ends. How can the year break be implemented dynamically?

Answer 1

The CTE is not necessary, but I'm assuming this is a simplified version.
To expand on my comment
with data as (
select
T1.FACTORY,
T1.DATE_YM,
T1.BUDGET
from TABLE_1 as T1
)
select
FACTORY,
DATE_YM,
sum(BUDGET) over (partition by Factory,left(Date_YM,4) order by DATE_YM asc rows between unbounded preceding and current row) as 'C_BUDGET_SUM'
from data
Results