add 1633

Author: fishercoder1534

README.md

@@ -1078,6 +1078,7 @@ _If you like this project, please leave me a star._ ★
 |1677|[Product's Worth Over Invoices](https://leetcode.com/problems/products-worth-over-invoices/)|[Solution](../master/database/_1677.sql) || Easy |
 |1667|[Fix Names in a Table](https://leetcode.com/problems/fix-names-in-a-table/)|[Solution](../master/database/_1667.sql) || Easy |
 |1661|[Average Time of Process per Machine](https://leetcode.com/problems/average-time-of-process-per-machine/)|[Solution](../master/database/_1661.sql) || Easy |
+|1633|[Percentage of Users Attended a Contest](https://leetcode.com/problems/percentage-of-users-attended-a-contest/)|[Solution](../master/database/_1633.sql) || Easy |
 |1607|[Sellers With No Sales](https://leetcode.com/problems/sellers-with-no-sales/)|[Solution](../master/database/_1607.sql) || Easy |
 |1581|[Customer Who Visited but Did Not Make Any Transactions](https://leetcode.com/problems/customer-who-visited-but-did-not-make-any-transactions/)|[Solution](../master/database/_1581.sql) || Easy |
 |1543|[Fix Product Name Format](https://leetcode.com/problems/fix-product-name-format/)|[Solution](../master/database/_1543.sql) || Easy |

database/_1633.sql

@@ -0,0 +1,2 @@
+--# Write your MySQL query statement below
+select contest_id, round((count(distinct(user_id)) * 100 / (select count(*) from Users)), 2) as percentage from Register group by contest_id order by percentage desc, contest_id;