SELECT
    YEAR_MONTH,
    MONTH_AMT,
    SUM(MONTH_AMT) OVER (ORDER BY YEAR_MONTH ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS CUML_AMT,
    YEAR_MOVE_AMT
FROM (
    SELECT
        YEAR_MONTH,
        MONTH_AMT,
        SUM(MONTH_AMT) OVER (ORDER BY YEAR_MONTH ROWS BETWEEN 11 PRECEDING AND CURRENT ROW) AS YEAR_MOVE_AMT
    FROM (
        SELECT
            strftime('%Y-%m', SALES_DATE) AS YEAR_MONTH,
            SUM(SALES_AMT) AS MONTH_AMT
        FROM SALES
        GROUP BY YEAR_MONTH
        ORDER BY YEAR_MONTH ASC
    )
)
WHERE YEAR_MONTH LIKE '2023-%'
;