Introduction
GROUP BY – Recap
ROLLUP
Instruction
Great! For this quiz, we're going to use a simple table:
department_cost(department, year, total_cost)
It shows the overall cost of running a given department in a given year. The cost is expressed in thousands of dollars.
Exercise
Show the sum of the total_cost for each department and year; the total sum of total_cost for each department across all years; and the grand total of total_cost across all departments and years.
Show the following columns: department, year, and the sum of total_cost (as total).
