WITH RSLT AS(
    SELECT
        (SELECT MIN(MONTHLY) FROM MRR_DATA) AS YM
        ,0 AS MRR
    UNION ALL
    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 < DATE((SELECT MAX(MONTHLY) FROM MRR_DATA), '1 month')
)
SELECT
    *
FROM
    RSLT
ORDER BY
    YM ASC
;