A guided sheet of every SQL pattern, optimisation trick, product metric, and business question I’ve seen across Zomato, Zepto, and Top Q-Comm, paired with the writing that explains the why.
Write real queries against real datasets, get graded on the spot, and build a streak while you get sharper. This is the tool the rest of the site builds up to.
Real PostgreSQL, in your browser
No sandbox limits, no setup. A real Postgres engine runs your query the instant you hit Run.
Graded the moment you submit
Check compares your output against the real answer and tells you exactly what passed.
Streaks and Sprint Coins
Solve daily, keep a streak, earn coins you spend on hints and full solutions.
Noob or Master mode
Practice with copy allowed, or lock it down and force yourself to actually type the query.
Eight steps, sequenced by what actually builds on what.
Jump straight to whatever topic is blocking you.
Long-form essays that explain the why, not just the how.
Practice SQL on real datasets, right in your browser.
Cheat sheets and reference cards, ready to download.