Train like it's interview week.
Everything in Query Dojo: every challenge, every solution, and timed mock interviews that show when you're ready.
Every problem from Easy to Hard, including the 51 premium ones and new drops.
Step-by-step explanations for every challenge, unlocked after your attempts.
25-minute sessions with four questions and no hints, scored like the real thing.
A 0 to 100 score from topic coverage, mock results and recent practice.
Progressive hints on every challenge when you're stuck.
Daily reminders and your belt, in your pocket.
Subscribing on the web is coming soon. One subscription will unlock Query Dojo everywhere.
Questions
Is anything free?
Yes. 34 challenges, all 79 lessons and the playground are free, with no account.
Can I subscribe on the web?
Web subscriptions are coming soon. Today you can subscribe in the Query Dojo iPhone app.
Is there a free trial?
No trial. The free challenges and lessons show you exactly how Query Dojo works before you pay.
Can I cancel anytime?
Yes. Subscriptions made in the app are managed and cancelled in your Apple ID settings.
Which SQL dialect is this?
Queries run on SQLite. Where PostgreSQL or MySQL differ, challenges include dialect notes.