SQLwak is a free SQL learning game — no signup, no download. You're a Graduate Analyst at Lion City Bank (fictional Singapore bank) solving 57 real business SQL problems. Foundational → Intermediate (JOINs) → Advanced (CTEs) → Expert (window functions like RANK OVER PARTITION BY). 9-table schema: retail banking + a maritime trade finance division with vessels and cargo shipments across SE Asia. Built with Next.js 15 + SQLite via WebAssembly. All queries run client-side. Open source on GitHub.

I got tired of SQL practice resources that feel like homework. Every "learn SQL" site has you selecting employees from a made-up HR table with no story behind it. SQLwak puts you inside a fictional Singapore bank as a Graduate Analyst. Your colleagues send you actual business requests — the Risk team needs a watchlist, Finance wants a vessel revenue ranking, Operations needs branch audit data. The maritime trade finance division (vessels, cargo shipments across SE Asia) came from wanting the Expert levels to feel genuinely interesting, not just syntactically harder. Everything runs client-side via SQLite/WASM — no backend, no signup, instant feedback. Would love to hear what SQL concepts you struggled most to learn!

SQLwak

Learn SQL by working at a fictional Singapore bank

Learn SQL by working at a fictional Singapore bank