WITH RSLT AS (
    -- 非再帰項
    SELECT (SELECT MIN(MONTHLY) FROM MRR_DATA) AS YM, 0 AS MRR
    UNION ALL
    -- 再帰項
    SELECT DATE(YM, '+1 month'), MRR + (SELECT NEW_MRR + EXPANSION_MRR - DOWNGRADE_MRR - CHURN_MRR FROM MRR_DATA WHERE MONTHLY = YM)
    FROM RSLT
    WHERE YM <= (SELECT MAX(MONTHLY) FROM MRR_DATA)
)

SELECT *
FROM RSLT
ORDER BY YM;