Introduction
Instruction
Keep going! You're halfway through!
Exercise
For each year, display the year (production_year, count how many games were released in this year (as the count column), what was the average cost of production (as the avg_cost column), and what was their average revenue (as the avg_revenue column).
Stuck? Here's a hint!
You'll need four columns:
production_year, COUNT(...) AS count, AVG(...) AS avg_cost, AVG(...) AS avg_revenue
And you'll need to group your results by the production_year column:
GROUP BY production_year
