Query Dojo: SQL Practice

Walk into your SQL interview ready.

Query Dojo is SQL interview practice that fits in a few minutes a day. Drill the classic questions, rehearse under a real interview clock, and see exactly what is wrong when a query fails.

PRACTICE THE CLASSIC QUESTIONS
85 interview-style SQL challenges, from finding the runner-up salary to top earners per department, monthly retention, login streaks, running totals and medians. Every query runs on a real database, right on your phone.

REHEARSE UNDER A REAL CLOCK
Timed mock interviews: 25 minutes, 4 questions, no hints. Finish with a readiness score out of 100, so you know where you stand before the real thing.

SEE EXACTLY WHY AN ANSWER IS WRONG
Every run is checked against the expected result. When it is off, you see what is missing or extra, from columns to rows. Hints and full solutions are there when you are stuck.

BUILD QUERIES WITHOUT A KEYBOARD
Tap tiles to build real queries, put lines in the right order, or type from scratch.

RELEARN WHAT YOU FORGOT
79 bite-size lessons, from SELECT and JOINs to window functions, CTEs, gaps and islands, and finding the median.

A PLAN FOR YOUR LEVEL
Tell us where you are and get a 4-week belt plan with the topics to focus on first.

EARN YOUR BLACK BELT
Every challenge and lesson moves you up, from white belt to black belt and beyond, with streaks to keep you consistent.

A PLAYGROUND FOR EVERYTHING ELSE
Run any SQL against 4 sample databases. Every run is rolled back, so experiment freely.

Query Dojo Premium is an auto-renewing subscription, billed monthly or yearly. Payment is charged to your Apple ID at confirmation. It renews automatically unless canceled at least 24 hours before the end of the current period, and you can manage or cancel it in your App Store account settings.

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