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Introduction
Exercises

## Instruction

Keep going! You're halfway through!

## Exercise

For each year, display the year (production_yearcode>, 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