Query Dojo vs SQLearn

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. Terms: https://querydojo.pages.dev/terms Privacy: https://querydojo.pages.dev/privacy

SQLearn teaches SQL the way it actually works — by writing and running queries LEARN Structured lessons cover everything from basic SELECT statements to JOINs, aggregations, window functions, CTEs, and transactions. Lessons end with a short quiz and a direct shortcut into the Playground so you can try what you just learned. PLAYGROUND A SQL editor with syntax highlighting and a keyword toolbar built for iPhone. Write any query, pick a schema, and run it — results appear instantly. Choose from built-in schemas or create your own with custom seed data. EXERCISES Guided tasks built around database schemas. Write your solution, run it, and compare it against the expected result. Stuck? Reveal the model answer and see exactly where your query differed. WHO IS THIS FOR? – Beginners learning SQL from scratch – Anyone who want to refresh or deepen their SQL skills TECHNICAL – Built-in SQLite engine, no dependencies, fully offline – Syntax highlighting and keyword toolbar in the editor – Schema viewer with table structure on demand – Supports iOS 17 and later