SELECT 
  strftime('%Y-%m',A1.SALES_DATE) as YEAR_MONTH
 ,SUM(A1.SALES_AMT) as MONTH_AMT
 ,SUM(A2.SALES_AMT) as CUML_AMT
 ,SUM(A2.SALES_AMT) OVER (ORDER BY strftime('%Y-%m',A1.SALES_DATE) rows between 11 preceding and current row) as YEAR_MOVE_AMT
FROM SALES A1
INNER JOIN SALES A2
ON  strftime('%Y-%m',A1.SALES_DATE) >= strftime('%Y-%m',A2.SALES_DATE)
WHERE A1.UPDATED_NO IS NULL
AND strftime('%Y-%m',A1.SALES_DATE) BETWEEN '2023-01' AND '2023-12'
GROUP BY strftime('%Y-%m',A1.SALES_DATE)
ORDER BY strftime('%Y-%m',A1.SALES_DATE) asc