Master SQL. Crack Interviews.
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A hands-on SQL learning platform for Data Analysts, BI Developers, Data Engineers, Analytics Engineers and Software Developers.
No credit card required • Free forever plan available
Everything You Need to Master SQL
From your first SELECT to advanced window functions - we've got you covered.
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Practice Arena
Correct - 5 rows returned
Everything You Need to Master SQL
From your first SELECT to advanced window functions — we've got you covered.
Learn by Doing, Not Reading
Write real SQL in our sandboxed editor. Get instant results, hints, and AI-powered feedback that explains not just what's wrong, but why.
- Integrated SQL editor with syntax highlighting
- Real dataset tables with schema viewer
- Instant query execution in isolated sandbox
- Step-by-step hints when you're stuck
- AI-powered solution explanations
- Query performance & optimization feedback
SELECT d.department_name, COUNT(e.id) AS employee_count, AVG(e.salary) AS avg_salary, RANK() OVER ( ORDER BY AVG(e.salary) DESC ) AS salary_rank FROM employees e JOIN departments d ON e.dept_id = d.id GROUP BY d.department_name HAVING COUNT(e.id) >= 5 ORDER BY avg_salary DESC;
Your SQL Journey, Structured
Follow our proven roadmap from beginner to SQL expert with XP tracking and achievements.
SELECT, WHERE, ORDER BY, Basic Aggregations
JOINs, GROUP BY, HAVING, Subqueries
CTEs, Window Functions, Query Optimization
Advanced CTEs, ranking, cohorts and analytical patterns
Simple, Transparent Pricing
Start free, upgrade when you're ready.
- 92 accessible SQL questions
- 10 practice runs per day
- 1 interview per week
- 3 AI reviews per day
- Leaderboard access
- Progress tracking
- 300 hands-on SQL challenges
- 50 Advanced & Expert SQL Challenges
- All difficulty levels
- Unlimited practice runs
- Up to 100 AI Query Reviews per day
- Unlimited Interview Simulator
- Solutions after a valid attempt
- Professional SQL Reference Pack — 20 pages of SQL content · 19 focused guides
Built for modern data roles
Practice SQL the Way It Is Used at Work
Designed for Data Analysts, BI Developers, Data Engineers, Analytics Engineers, and developers preparing for SQL interviews.
Realistic datasets, immediate result comparison, and a clear progression from fundamentals to reporting queries.
Query patterns used in dashboards and analytical models, with alternative solutions and optimization notes.
Timed, server-graded practice with a focused report showing strengths and the next topics to study.
Frequently Asked Questions
Is SQL Master free to use?
Yes. The free plan includes 92 accessible questions, 1 interview per week, and 3 AI reviews per day. Upgrade to Pro for all 300 challenges, including the 50-challenge Advanced SQL track, and unlimited eligible usage.
What SQL dialect is used?
Questions are written in standard SQL that works across PostgreSQL, MySQL, and SQLite. The sandbox uses SQLite for safe, isolated execution.
Can I use SQL Master to prepare for technical interviews?
Yes. The library covers common interview topics including filtering, joins, aggregations, CTEs, and window functions, with timed simulations for rehearsal.
How does the AI reviewer work?
The reviewer analyzes correctness, performance, best practices, and alternative approaches. Core SQL execution and grading still work if AI is unavailable.