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New Monthly SQL Practice for December 2021!

If you are a more advanced SQL user who is comfortable writing complex JOINs, you can check your knowledge with December's SQL Practice. Every month on, you'll find a new challenge to solve.

Maybe this is the first time you've come across our Monthly SQL Practices. offers one SQL Practice each month: basic levels on even-numbered months and advanced levels on odd-numbered months. Each SQL Practice takes about an hour to complete and contains 5–10 exercises to help you hone your skills.

Each Monthly SQL Practice features a different business or hobby. We've had practices that feature family trees, a language school, a book exchange, a job agency, rental cars, stars and astronomy, auto repair, baking, pizza, movies, U.S. cities, and more.

In our December 2021 SQL Practice, you'll meet Scott – a board game enthusiast who decided to run his own e-store. He needs your help to decide what games and genres are popular, which customers are the most loyal, etc. Can your SQL powers help him gather needed information? It shouldn't be too hard if you have finished our SQL Basics course and SQL JOINs course or understand the concepts we've covered there.

As a reminder, this month's SQL Practice is at an advanced level. Remember to use the hints, and have fun!