|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|

select contest_id, round((count(distinct(user_id))*100/ (selectcount(*)from Users)),2)as percentagefrom Registergroup by contest_idorder by percentagedesc, contest_id;