SQL Practice
Real-life business problems on real tables. Read the scenario, write the query, and get it checked instantly.
Intermediate25 pts
Repeat-purchase rate by country
CTEs & Recursion
Solve challengeIntermediate25 pts
Cloudpeak MRR, month by month
CTEs & Recursion
Solve challengeIntermediate25 pts
Rider cohorts by month of first trip
CTEs & Recursion
Solve challengeExpert50 pts
Black Friday month: the 7-day rolling average
CTEs & Recursion
Solve challengeExpert50 pts
Span of control: who really runs the org?
CTEs & Recursion
Solve challengeExpert50 pts
Quarter by quarter: how fast is Nordvik growing?
CTEs & Recursion
Solve challengeExpert50 pts
Lahore to New York with at most two stops
CTEs & Recursion
Solve challengeExpert50 pts
Filling the empty days: May 2026 daily plays
CTEs & Recursion
Solve challengeExpert50 pts
New versus returning listeners, month by month
CTEs & Recursion
Solve challenge