SQL Challenges
Five hand-written Easy challenges for SQL. Each Run gets a fresh in-memory SQLite database. Tests use leading `-- expect: <n> rows, {row}` comments — the runtime parses them per query.
- SQL
- 120 lessons
- ~24 hours
- Free
- by Fishbones
Learn SQL for free on Libre Academy with the SQL Challenges challenge pack: 120 interactive lessons you complete by writing real code in a built-in editor, graded instantly by hidden tests. No paywall, no sign-up — it runs in your browser and the free desktop app.
What you get
- Hands-on lessons with a real editor and instant, test-graded feedback.
- Free and open source — no account required to start.
- Runs in your browser, and offline in the free desktop app.
- SQL runs in your browser.
What's inside
- Easy
- Medium
- Hard