select a.金额 - b.金额 - c.金额 as 金额 from 表1 a join 表2 b on a.时间 = b.时间 join 表3 c on a.时间 = c.时间
select a.s-b.s-c.s as s1 from (select sum(金额) as s from 表一) as a,(select sum(金额) as s from 表二) as b,(select sum(金额) as s from 表三) as c
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