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select groups, cast(count_in_group as float)/cast(total_user_count as float) as percentage from( select groups, total_user_count, count(Id) as count_in_group from ( select Id, case when "post_count" = 0 then '0' when "post_count" > 0 and "post_count" <= 10 then '1-10' when "post_count" > 10 then '10+' end as groups, (select count(Id) from Users) as "total_user_count" from ( select u.Id, count(p.Id) as "post_count" from Users u full outer join Posts p on (p.OwnerUserID = u.Id) group by u.Id)t )t2 group by groups,total_user_count )t3 ;