- Sales Analysis III
- Duplicate Emails
- Bank Account Summary II
- Actors and Directors Who Cooperated At Least Three Times
- Top Travellers
- Market Analysis I
- Capital Gain/Loss
- The Latest Login in 2020
- Game Play Analysis I
- Find Total Time Spent by Each Employee
- Customer Placing the Largest Number of Orders
- User Activity for the Past 30 Days I
- Sales Person
- Rising Temperature
- Find Followers Count
- Daily Leads and Partners
- Tree Node
- Second Highest Salary
- Rearrange Products Table
- Employees With Missing Information
- Customer Who Visited but Did Not Make Any Transactions
- Combine Two Tables
- Article Views I
- Swap Salary
- Recyclable and Low Fat Products
- Patients With a Condition
- Group Sold Products By The Date
- Fix Names in a Table
- Find Customer Referee
- Delete Duplicate Emails
- Customers Who Never Order
- Calculate Special Bonus
- Big Countries