with recursive t_mrr as (
    select *, 0 as MRR FROM MRR_DATA WHERE monthly = (select min(monthly) from MRR_DATA)
    union all
    select x.*,
        pre.MRR + pre.NEW_MRR + pre.EXPANSION_MRR - pre.DOWNGRADE_MRR - pre.CHURN_MRR as MRR
        FROM MRR_DATA as x, t_mrr as pre
        WHERE pre.monthly = date(x.monthly, '-1 month')
)

select monthly AS YM, MRR AS MRR from t_mrr
order by monthly