SQL Tutorial

Learn SQL in your browser

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Worked examples and self-checking exercises on Pacific Northwest towns, counties, and flight data — no install, no account, no servers. Everything runs in your browser via SQLite-compiled-to-WebAssembly.

📘 Examples

Walkthroughs of SQL patterns on the PNW towns + counties data, with the solution available up front.

🛫 Exercises

Practice problems on the flight data. Write a query, click Check answer, get instant feedback.

🧪 Scratchpad

Free-form query editor. Pick a database and explore.

How it works

  • SQLite in your browser — both databases are loaded once and cached locally.
  • Self-check exercises — your query's result is compared against the reference solution. Row order doesn't matter unless the problem says otherwise.
  • Hints & solutions on demand — reveal one hint at a time, or show the full solution when you're truly stuck.
  • Progress is saved locally — your work persists in your browser via localStorage.