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;