finish Percentage of Users Attnded a Contest

Author: babebp

SQL/SQL-50/Percentage_of_Users_Attended_a_Contest.sql

@@ -0,0 +1,5 @@
+select contest_id, 
+round(count(distinct user_id) / (select count(user_id) from Users) * 100, 2) as percentage
+from Register
+group by contest_id
+order by percentage desc, contest_id asc;