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未测试select a.*
, (select sum(bnum) from b where a.id = b.id) as bnum
, (select sum(cnum) from b where a.id = c.id) as cnum
from a
, (select sum(bnum) from b where a.id = b.id) as bnum
, (select sum(cnum) from c where a.id = c.id) as cnum
from a
from A, (select id,sum(bnum) as s1 from B group by id) tb,(select id,sum(cnum) as s2 from C group by id) tc
where A.bid=tb.id and a.cid=tc.id