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Welcome to my HackerRank SQL Solutions Repository.
This repository contains my solutions to SQL challenges solved on HackerRank, covering everything from basic queries to advanced database concepts. Every solution is written with an emphasis on query optimization, readability, analytical thinking, and industry-standard SQL practices.
The objective of this repository is to strengthen my understanding of relational databases, improve analytical problem-solving skills, and prepare for technical interviews in Data Analytics, Data Science, Business Intelligence, and Software Engineering.
Earning the 5★ Gold Badge in SQL demonstrates consistent practice and a strong understanding of relational database concepts.
This milestone reflects proficiency in writing efficient SQL queries, analyzing structured datasets, and solving real-world database problems.
It also showcases the ability to think analytically while working with large datasets and business-oriented scenarios.
✔ Basic Select Queries
✔ Filtering & Sorting
✔ Aggregation Functions
✔ GROUP BY & HAVING
✔ Joins
✔ Self Joins
✔ Multiple Table Queries
✔ Subqueries
✔ Common Table Expressions (CTEs)
✔ Window Functions
✔ Ranking Functions
✔ CASE Statements
✔ Date Functions
✔ String Functions
✔ Mathematical Functions
✔ Advanced SQL Queries
✔ Database Optimization Concepts
✔ Query Performance
HackerRank-SQL-Solutions/
│
├── Basic Select/
├── Advanced Select/
├── Aggregation/
├── Basic Join/
├── Advanced Join/
├── Alternative Queries/
├── Advanced SQL/
├── Challenges/
├── Interviews/
└── README.md
- ✅ Well-organized SQL solutions
- ✅ Beginner to advanced SQL problems
- ✅ Optimized and readable queries
- ✅ Industry-standard SQL syntax
- ✅ Easy-to-understand query logic
- ✅ Regular repository updates
- ✅ Interview-focused practice
- ✅ Business-oriented analytical problems
This repository is maintained to:
- Strengthen SQL fundamentals
- Master relational database concepts
- Improve analytical thinking
- Write optimized SQL queries
- Prepare for technical interviews
- Build a professional SQL portfolio
- Demonstrate database problem-solving skills
- Relational Database Management
- Data Retrieval
- Data Cleaning
- Data Aggregation
- Query Optimization
- Data Analysis
- Business Intelligence
- Data Transformation
- Window Functions
- Complex Joins
- Analytical SQL
- Reporting Queries
- SQL
- MySQL
- HackerRank
- VS Code
| Milestone | Status |
|---|---|
| SQL Badge | 🥇 Gold (5★) |
| Repository | Active |
| Difficulty | Beginner → Advanced |
| Updates | Continuous |
- Solve every SQL challenge on HackerRank
- Master advanced SQL optimization
- Strengthen PostgreSQL & MySQL knowledge
- Learn query execution plans
- Explore database indexing strategies
- Build end-to-end SQL portfolio projects
- Integrate SQL with Python & Power BI
- Apply SQL in real-world Data Analytics projects
SQL is the foundation of modern data-driven decision-making.
Whether working as a Data Analyst, Data Scientist, Business Intelligence Analyst, Analytics Engineer, or Software Engineer, SQL remains one of the most valuable technical skills for extracting meaningful insights from structured data.
This repository reflects my commitment to mastering one of the most essential technologies in the data ecosystem.
Suggestions for improving query performance, readability, or alternative approaches are always welcome.
Feel free to open an issue or submit a pull request.
If this repository helps you:
⭐ Star this repository
🍴 Fork it
📢 Share it with other learners
Your support encourages continuous learning and consistent contributions.
- GitHub
- HackerRank
SQL Basics ████████████████████ 100%
Intermediate SQL ████████████████████ 100%
Advanced SQL ███████████████░░░░ 80%
Database Concepts ██████████████░░░░░ 75%
Query Optimization ████████████░░░░░░░ 65%
Real Projects █████████░░░░░░░░░░ 45%
"Continuous learning, analytical thinking, and disciplined problem-solving are the foundation of becoming a skilled Software Engineer, Data Scientist, and Data Analyst."