Hard Problems

Authors and Their Books

Best Customer Per Category

Books With Author and Publisher

Customer Order Date Gaps

Running Total of Customer Spend

Dense Rank Salaries Company-Wide

Departments Above Company Average

Departments Above Average Salary

Employees and Their Managers

Employee Rank Within Department

Manager vs Individual Contributor Pay

Grade Trend Per Term

Monthly Order Trend

Movie Rank Per Genre

Movies Above Their Genre's Average Budget

Movies Above Genre Midpoint

Pivot Order Status Counts

Rank Students Within Each Course

Manager Chain Depth

Running Revenue Over Time

Cumulative Salary Per Department

Students Above Course Average

Top Spender Per City