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select s1.xh,s2.xm
from s1 , s2
where not exists (select 1 from qq where xm=s2.xm and xh=s1.xh)
select x.*
from (
select s1.xh,s2.xm
from s1 , s2) x left join qq on x.xh=qq.xh and x.xm=qq.xm
where qq.xh is null