with  test as (
select MONTHLY,0 as MRR from MRR_DATA
union all
select a.MONTHLY,b.NEW_MRR + b.EXPANSION_MRR - b.DOWNGRADE_MRR - b.CHURN_MRR as MRR from MRR_DATA a join MRR_DATA b on a.MONTHLY > b.MONTHLY
union all
select DATE ((select max(MONTHLY) mm from MRR_DATA), '+1 month'),a.NEW_MRR + a.EXPANSION_MRR - a.DOWNGRADE_MRR - a.CHURN_MRR as MRR from MRR_DATA a 
)
select MONTHLY as YM,sum(MRR) MRR from  test 
group by MONTHLY
order by MONTHLY asc