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select w.author,sum(t.ct) sumnum
from writer w left join
(select t1.arcid,format(1/count(*),1) ct
from writer t1,content t2
where t1.arcid=t2.id and t2.islock=1
group by arcid) t
on w.arcid=t.arcid
group by w.author
order by sumnum desc
limit 30;



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