SQL Practice - Learn SQL

Learn SQL by actually writing it. Every exercise runs on a real SQLite database inside your phone, so you type real queries, see real result tables and get instant feedback, with no internet connection needed. A REAL SQL ENGINE IN YOUR POCKET • Real SQLite runs on your device: SELECT, JOIN, GROUP BY, subqueries, CTEs, window functions, INSERT, UPDATE and DELETE • Four practice databases (company, shop, movies, school) to explore freely • Code editor with keyword and table/column suggestion chips • Your result is compared with the expected answer row by row, so you see exactly what is different • Plain-English explanations for common errors such as "no such column" or "ambiguous column name" • Schema drawer and table diagram so you always know which columns exist 60 LESSONS IN 10 UNITS Short concept cards with worked examples, followed by hands-on exercises: • Selecting and filtering data (WHERE, IN, BETWEEN, LIKE, NULL) • Sorting and pagination (ORDER BY, LIMIT, OFFSET) • Aggregates and grouping (COUNT, SUM, AVG, GROUP BY, HAVING) • Joins of every kind, self joins and multi-table queries • Subqueries, CTEs and CASE expressions • Window functions (ROW_NUMBER, RANK, running totals) • Changing data and creating tables 150 CHALLENGES + A DAILY PUZZLE • 50 easy, 50 medium and 50 hard challenges • A new daily challenge every day • Hard challenges unlock with a short optional video or with Pro SQL INTERVIEW PREP • 120 interview questions with clear answers • Timed mock interview to practise answering under pressure • Bookmark the questions you want to review again 20 PORTFOLIO PROJECTS Multi-step projects on realistic business data, such as revenue analysis and salary benchmarking, unlocked after Unit 5 or with Pro. BUILD A DAILY HABIT • Pick a daily goal of lessons or challenges • Streaks with streak freezes so one busy day does not reset your progress • Optional daily reminder at the time you choose PRIVATE AND OFFLINE Your queries and progress stay on your device. No account needed. Free with ads. A one-time Pro purchase removes ads and unlocks all hard challenges and projects. No subscription.