Welcome to the HackerRank SQL Solutions repository! 🚀 This repo contains optimized SQL solutions for HackerRank SQL challenges, ranging from basic queries to advanced SQL techniques.
Each solution includes:
✔️ Problem Statement 📜
✔️ Optimized SQL Query 💡
✔️ Explanation of the Approach 📝
Whether you're a beginner learning SQL or a data analyst looking to sharpen your skills, this repository is for you!
The repository is structured into categorized folders based on SQL topics:
📂 HackerRank-SQL-Solutions
│-- 📂 Basic Select
│-- 📂 Advanced Select
│-- 📂 Aggregation
│-- 📂 Basic Join
│-- 📂 Advanced Join
│-- 📂 Alternative Queries
Each folder contains SQL scripts with the corresponding problem statements and solutions.
✔️ Basic Queries: SELECT, WHERE, ORDER BY, LIMIT
✔️ Aggregation: GROUP BY, HAVING, COUNT, SUM, AVG
✔️ Joins: INNER JOIN, LEFT JOIN, RIGHT JOIN, FULL JOIN
✔️ Advanced SQL: Window Functions, CTEs, Subqueries
Before running the solutions, make sure you have:
✅ A SQL environment installed (MySQL, PostgreSQL, SQLite, etc.)
✅ Basic knowledge of SQL syntax
- Clone the repository
git clone https://github.com/Vishwas-Chakilam/HackerRank-SQL-Solutions.git
- Navigate to the relevant topic folder
- Open the SQL script and execute it in a compatible SQL environment
Different SQL problems can have multiple valid approaches. The Alternative Solutions folder contains optimized or different methods to solve the same problems for better understanding.
💡 Have a better solution? Found an optimization?
📌 Feel free to contribute by opening a pull request!
Contribution Guidelines:
- Follow standard SQL formatting for readability
- Comment your query to explain the approach
- Ensure correctness and efficiency before submitting
Here are some great learning materials to help you master SQL:
📌 SQL Tutorial - W3Schools
📌 Mode Analytics SQL Tutorial
📌 LeetCode SQL Questions
📌 PostgreSQL Documentation
The solutions are written in standard SQL and should work in MySQL, PostgreSQL, and SQL Server. Some functions may vary slightly across different databases.
Fork the repo, create a new branch, add your solution, and open a pull request! 🎉
Apart from HackerRank, you can practice on:
- LeetCode (SQL Questions)
- Mode Analytics SQL Tutorials
- SQLZoo.net
This repository is open-source and available under the MIT License.
For queries, discussions, or suggestions:
📧 Reach out via GitHub Issues or Email
📌 If this repo helped you, don’t forget to ⭐ star it and share! 🚀