;with use cte1 as(
select T1.id,sum(size) assum1 fromT1 inner joinT2 onT1.id=T2.id
)
,
cte2 as(
select T1.id,sum(size) as sum1 fromT1 inner joinT2 onT1.id=T2.id
)
select cte1.sum1,cte2.sum1 from cte1 inner join cte2 on cte1.id=cte2.id



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