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--这样呢?
select t.供应商id , sum(t.ttlout) ttlout , sum(m.总额) ttlin from
(select 供应商id , order_id , sum(总额) ttlout from order_out group by 供应商id , order_id) t,order_in m
where t.order_id = m.order_id
group by t.供应商id
--这样?
select 供应商id , sum(总额) ttlout , ttlin = (select sum(总额) from order_in where order_id = t.order_id)
from order_out t
group by 供应商id
--这样?
select 供应商id , sum(总额) ttlout , ttlin = (select sum(总额) from order_in where order_id = t.order_id)
from order_out
group by 供应商id