Q&A about the site for students and teachers of all martial arts
select count (u.ID) *100/(select count (u.ID) as count_of_users from users u join Posts p on u.ID=p.OwnerUserID having count(p.ID)=0) as percentage_of_total, count (u.ID) *100/(select count (u.ID) as count_of_users from users u join Posts p on u.ID=p.OwnerUserID having count(p.ID) between 1 and 3) as percentage_of_tota13l, count (u.ID) *100/(select count (u.ID) as count_of_users from users u join Posts p on u.ID=p.OwnerUserID having count(p.ID) between 1 and 4) as percentage_of_total14, count (u.ID) *100/(select count (u.ID) as count_of_users from users u join Posts p on u.ID=p.OwnerUserID having count(p.ID)>5) as percentage_of_total4 from users u