SQL Challenge Hub

Introduction

Hi there! Welcome to the SQL Challenge Hub! Whether you’re just starting out with SQL or already have some experience, one thing is for sure—practice is the key to mastering it. That’s why I’ve put together a collection of SQL challenges with varying levels of difficulty. These challenges are designed to give you hands-on experience and help you sharpen your SQL skills. The best part? It’s all completely FREE! No sign-ups, no strings attached. Just pick a problem and dive in!

Challenge ID | Category | Difficulty

Challenge 1 | Aggregating Data | ★★☆☆☆
Challenge 2 | Aggregating Data | ★★☆☆☆
Challenge 3 | Filtering Data | ★★☆☆☆
Challenge 4 | Group By | ★★★☆☆
Challenge 5 | Sum Calculation | ★★☆☆☆
Challenge 6 | Data Comparison | ★★☆☆☆
Challenge 7 | Max Value | ★★☆☆☆
Challenge 8 | Min Value | ★★☆☆☆
Challenge 9 | Count Query | ★★★☆☆
Challenge 10 | Conditional Query | ★★★☆☆
Challenge 11 | Average Calculation | ★★★☆☆
Challenge 12 | Data Comparison | ★★★☆☆
Challenge 13 | Sum Calculation | ★★★☆☆
Challenge 14 | Conditional Query | ★★★☆☆
Challenge 15 | Data Comparison | ★★★☆☆
Challenge 16 | Max Value | ★★★☆☆
Challenge 17 | Min Value | ★★★★☆
Challenge 18 | Average Calculation | ★★★★☆
Challenge 19 | Data Comparison | ★★★★☆
Challenge 20 | Advanced Aggregation | ★★★★★
Challenge 21 | Complex Joins | ★★★★★
Challenge 22 | Nested Queries | ★★★★★
Challenge 23 | Advanced Grouping | ★★★★☆
Challenge 24 | Advanced Filtering | ★★★★★
Challenge 25 | Complex Calculations | ★★★★☆
Challenge 26 | Self Joins | ★★★★★
Challenge 27 | Advanced Subqueries | ★★★★★
Challenge 28 | Recursive CTEs | ★★★★★
Challenge 29 | Advanced Calculations | ★★★★☆
Challenge 999 | Experiment | ★★★★☆

Wanna contribute?

Have a cool SQL challenge you’d like to share? Or maybe you want to help others learn SQL for free? I’d love to hear from you! Send me your challenge, and I’ll review it. If it fits, I’ll add it to the list with a shoutout to you in the credits. Let’s make learning SQL fun, accessible, and free for everyone!