SELECT T1.WK1 AS YEAR_MONTH
      ,T1.WK2 AS MONTH_AMT
      ,SUM(T1.WK2) OVER (ORDER BY T1.WK1) AS CUML_AMT 
      ,T2.WK3 AS YEAR_MOVE_AMT
  FROM
 (
 SELECT SUBSTR(SALES_DATE,0,8) WK1
       ,SUM(SALES_AMT) WK2
   FROM SALES T1
  WHERE UPDATED_NO IS NULL
  GROUP BY SUBSTR(SALES_DATE,0,8)
 ORDER BY 1
 ) T1
 LEFT OUTER JOIN
 (
 SELECT WK1
      ,WK2
      ,SUM(WK2) OVER (ORDER BY WK1 ROWS BETWEEN 11 PRECEDING AND 0 FOLLOWING) WK3
  FROM
 (
 SELECT SUBSTR(SALES_DATE,0,8) WK1
       ,SUM(SALES_AMT) WK2
   FROM SALES T1
  WHERE UPDATED_NO IS NULL
  GROUP BY SUBSTR(SALES_DATE,0,8)
 ORDER BY 1
 )
 )T2
 ON T1.WK1 = T2.WK1
 WHERE T1.WK1 >= '2023-01'
   AND T1.WK1 <= '2023-12'
 ORDER BY 1
;