Practice problems across 75+ categories
Practice problems frequently asked at Database • 324 problems | 120 Easy | 135 Medium | 61 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 76 | Delete Duplicate Emails | Easy | Database |
| 77 | Department Highest Salary | Medium | Database |
| 78 | Department Top Three Salaries | Hard | Database |
| 79 | DNA Pattern Recognition | Medium | Database |
| 80 | Drop Duplicate Rows | Easy | Database |
| 81 | Drop Missing Data | Easy | Database |
| 82 | Drop Type 1 Orders for Customers With Type 0 Orders | Medium | Database |
| 83 | Duplicate Emails | Easy | Database |
| 84 | Dynamic Pivoting of a Table | Hard | Database |
| 85 | Dynamic Unpivoting of a Table | Hard | Database |
| 86 | Election Results | Medium | Database |
| 87 | Employee Bonus | Easy | Database |
| 88 | Employee Task Duration and Concurrent Tasks | Hard | Database |
| 89 | Employees Earning More Than Their Managers | Easy | Database |
| 90 | Employees Project Allocation | Hard | Database |
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