SQLite vs Database Keys and Constraints

SQLite: SQL Practice SQL is the #1 skill you need to break into data analytics. With our app, you can write your first SQL query in your very first minute — no software to install, no complicated server setup. LEARN BY DOING, NOT GUESSING
Most apps test you with multiple-choice questions. Here, you write every query yourself in a real SQLite editor — because the only way to truly learn SQL is to type it, run it, and see the results. DATA YOU’LL ACTUALLY WANT TO QUERY
Forget the same old “employees” and “students” tables from every textbook. Explore datasets you’ll genuinely enjoy, and stay motivated as you go from basic filters to complex aggregations. FROM BEGINNER TO ADVANCED, AT YOUR OWN PACE
Start with simple SELECT queries and work your way up to JOINs, subqueries, and aggregate functions. Whether you’re preparing for a technical interview, a data science course, or your first job as an analyst or developer, the path is laid out for you. BUILD YOUR OWN PLAYGROUND
Create your own tables and fill them with whatever data you want. Practice exactly the queries you need for work, school, or interviews — your database, your rules. TAKE YOUR WORK WITH YOU
Export your tables and exercises to CSV or PDF with a clean, professional layout. Perfect for sharing with classmates or coworkers, adding to your notes, or showing off your progress. MAKE IT YOURS
Choose from five beautiful, professional themes and practice in an editor that matches your style. PRACTICE ANYWHERE — 100% OFFLINE
On the subway, on the couch, at the beach, or in class. Everything runs on your device, so you can practice SQLite anytime, no internet required. Download SQLite: SQL Practice and give yourself a real edge in learning SQL.

Database Keys and Constraints is an independent study app for learners who want focused practice on relational database design rules, SQL integrity concepts, and exam-style reasoning. Use it to review fundamentals, build practical skills, avoid common pitfalls, and explore advanced concepts across 160 questions. Every question includes an explanation, so you can learn why an answer is right and where mistakes usually happen. Features: - 160 questions on keys, constraints, relationships, and design logic - Spaced repetition using FSRS intervals - Weak-point heatmap to target fragile areas - Daily challenge for steady review - Mock exams for timed practice - Clear explanations for every question - Offline practice, no login required Built for students, interview preparation, database course review, and anyone strengthening SQL schema design knowledge. Independent study app for Database Keys and Constraints practice. Not affiliated with, endorsed by, or sponsored by any company, certification body, exam operator, or vendor. All trademarks belong to their respective owners. Practice offline, no login required.