with A as (
    select ( select min(MONTHLY) from MRR_DATA ) as YM , 0 as MRR
    
    union all
    select
        DATE( YM, '+1 month')
        , MRR + NEW_MRR+EXPANSION_MRR-DOWNGRADE_MRR-CHURN_MRR
    from A
    inner join MRR_DATA on MRR_DATA.MONTHLY = A.YM
    where YM < DATE((select max(MONTHLY) from MRR_DATA), '+1 month')
)
select * from A order by YM ;