Welcome to the 50 Essential SQL Questions repository — a curated collection of SQL problems covering basic to intermediate concepts. This set is perfect for anyone preparing for data-related roles or sharpening their SQL fundamentals.
- 🧠 Focus: Basic to Intermediate SQL Topics
- 📦 Total Questions: 50 Handpicked Exercises
- ⏳ Prep Time: Ideal for a 1-month study plan
- 🛠️ Format: Each problem includes a description, example, and solution
- ✅ Perfect for interview prep, daily practice, or structured revision
- Filtering and sorting
- Joins and subqueries
- Aggregation (GROUP BY, HAVING)
- Window functions
- Set operations
- Data cleaning and transformation
Feel free to fork the repo, track your progress, or contribute improvements!
💡 Tip: Use 1–2 questions per day for consistent learning. All problems are designed to reinforce key SQL concepts in a practical way.