Joins
6 problems. Tick each as you solve it.
0 / 6 solved
- easy Inner Join Basics: Employees and Departments
- easy Left Join to Find Customers With No Orders
- medium Anti-Join: Products Never Ordered (NOT EXISTS vs NOT IN)
- medium Join With Aggregation: Headcount and Average Salary per Department
- medium Multi-Table Join: Customers, Orders, and Products
- medium Self Join: Employees and Their Managers