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SQL code:
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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You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') t ON w.arcid = t.arcid GROUP BY w.author limit 0,1' at line 5

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