SQL Star

SQL Star — Practice SQL. Solve Real Problems. Prepare for Interviews.
SQL Star is an offline SQL practice and interview-preparation app built for students, developers, analysts, and anyone preparing for SQL technical interviews all without an internet connection.
No account required.
No ads.
No subscription.

💻 A Real SQL Playground on Your Phone
Don't just memorize SQL syntax. Write and run it.

SQL Star includes a mobile-optimized SQL editor powered by SQLite, so you can practice queries directly on your device.

You can:

• Write free-hand SQL queries
• Execute queries locally
• Explore preloaded datasets
• Create your own custom tables
• Choose column names and data types
• Add your own sample rows
• Practice filtering, aggregation, subqueries, CTEs, window functions and more
• Use one-tap SQL symbol shortcuts designed for mobile typing

Your SQL and database execution stay on your device.

No internet connection required.

🧪 Build Your Own Tables
Want to practice with your own dataset?

The Custom Table Builder lets you create a practice table without manually writing a long CREATE TABLE statement.
Define your columns → choose data types → add rows → start writing SQL.

🎯 Solve Realistic SQL Scenarios
Practice SQL through business problems instead of isolated syntax exercises.
You'll encounter scenarios involving areas such as:
• Product analytics
• User activity
• Supply chain

Each scenario gives you the context, schema, and sample data you need to solve the problem.
Then it's your turn to write the SQL.

🧠 Don't Just See the Answer — Understand It
Explore detailed analysis for each question

🏢 Company-Inspired SQL Interview Practice
Prepare with SQL problems inspired by the types of scenarios and concepts encountered in technical hiring.

Practice questions associated with companies including:
**Google • Amazon • Meta • Microsoft and many more
Additional placement practice covers a wider range of companies and difficulty levels.

Important: These are company-inspired interview-style questions, not official or guaranteed questions from these companies.

🧩 SQL Interpreter MCQs
Sometimes the hardest SQL questions aren't about writing a query.

They're about understanding exactly what an existing query will do.

SQL Star includes SQL Interpreter MCQs that test your ability to reason about query behavior, edge cases, NULL handling, operators, and SQL semantics.

Read the query → understand what SQL will do → choose the correct outcome.

📅 365 Days of SQL Practice
Build a consistent SQL practice habit with a large library of scenario-based challenges.

365 Scenario Sessions

Previous challenges remain accessible, so missing a day doesn't mean losing access to the problem.

The questions are organized across companies, scenarios, and difficulty levels and are designed to avoid simply repeating the same questions across sections.
You can start practicing without paying.

The free version includes:

✓ Free-hand SQL practice
✓ Custom Table Builder
✓ 100 Scenario Session questions
✓ 125 Placement questions
✓ Progress tracking
✓ Offline SQL execution
✓ SQL Interpreter/Debugger MCQs as they progressively unlock
✓ No account required
✓ No ads

💎 Premium — One-Time Purchase
Want the complete practice library?

Premium unlocks:
✓ All 365 Scenario Sessions immediately
✓ Premium learning resources
✓ SQL interview and advanced reference material
✓ Database internals and performance resources
✓ System design interview resources
✓ Everything included in the free version
✓ No subscription

Pay once. No recurring subscription.

📚 Go Beyond SQL Questions
Premium also includes in-depth reference resources covering areas such as:

• SQL interview preparation
• Advanced SQL concepts
• Query thinking and patterns
• Database internals
• Indexing and performance
• Storage concepts
• System design
• Architecture trade-offs
• Interview preparation