| 184 | Department Highest Salary | Medium |
| 185 | Department Top Three Salaries | Hard |
| 196 | Delete Duplicate Emails | Easy |
| 197 | Rising Temperature | Easy |
| 262 | Trips and Users | Hard |
| 511 | Game Play Analysis I | Easy |
| 584 | Find Customer Referee | Easy |
| 586 | Customer Placing the Largest Number of Orders | Easy |
| 595 | Big Countries | Easy |
| 596 | Classes More Than 5 Students | Easy |
| 601 | Human Traffic of Stadium | Hard |
| 607 | Sales Person | Easy |
| 608 | Tree Node | Medium |
| 620 | Not Boring Movies | Easy |
| 626 | Exchange Seats | Medium |
| 627 | Swap Salary | Easy |
| 1050 | Actors and Directors Who Cooperated At Least Three Times | Easy |
| 1084 | Sales Analysis III | Easy |
| 1141 | User Activity for the Past 30 Days I | Easy |
| 1148 | Article Views I | Easy |
| 1158 | Market Analysis I | Medium |
| 1179 | Reformat Department Table | Easy |
| 1393 | Capital Gain/Loss | Medium |
| 1484 | Group Sold Products By The Date | Easy |
| 1527 | Patients With a Condition | Easy |
| 1541 | Top Travellers | Easy |
| 1581 | Customer Who Visited but Did Not Make Any Transactions | Easy |
| 1587 | Bank Account Summary II | Easy |
| 1667 | Fix Names in a Table | Easy |
| 1693 | Daily Leads and Partners | Easy |