select * from piao_post a
where (a.title,a.content) in (select title,content from piao_post group by
title,content having count(*) > 1)
delete from piao_post a
where (a.title,a.content) in (select title,content from piao_post group by
title,content having count(*) > 1)
and pid not in (select min(pid) from piao_post group by title,content having
count(*)>1)
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