select SUBSTR(SALES_DATE, 1, 7) as YEAR_MONTH,
sum(SALES_AMT) as MONTH_AMT,
sum(SALES_AMT) over (order BY strftime('%Y-%m', SALES_DATE)) as CUML_AMT
from SALES
where UPDATED_NO is null
and SALES_DATE >= '2023-01-01'
and SALES_DATE <= '2023-12-31'
GROUP BY strftime('%Y-%m', SALES_DATE)
order by YEAR_MONTH asc