HackerRank SQL Solutions

📌 Introduction

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!

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📂 Repository Structure

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.

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🚀 Topics Covered

✔️ 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

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🔧 Prerequisites

Before running the solutions, make sure you have:
✅ A SQL environment installed (MySQL, PostgreSQL, SQLite, etc.)
✅ Basic knowledge of SQL syntax

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🛠️ How to Use

1. Clone the repository

   git clone https://github.com/Vishwas-Chakilam/HackerRank-SQL-Solutions.git

2. Navigate to the relevant topic folder
3. Open the SQL script and execute it in a compatible SQL environment

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💡 Alternative Solutions

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.

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🤝 Contributions

💡 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

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📚 Useful Resources

Here are some great learning materials to help you master SQL:

📌 SQL Tutorial - W3Schools
📌 Mode Analytics SQL Tutorial
📌 LeetCode SQL Questions
📌 PostgreSQL Documentation

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❓ FAQs

1️⃣ What SQL database should I use to run these queries?

The solutions are written in standard SQL and should work in MySQL, PostgreSQL, and SQL Server. Some functions may vary slightly across different databases.

2️⃣ How can I contribute?

Fork the repo, create a new branch, add your solution, and open a pull request! 🎉

3️⃣ How can I practice SQL more?

Apart from HackerRank, you can practice on:

• LeetCode (SQL Questions)
• Mode Analytics SQL Tutorials
• SQLZoo.net

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📜 License

This repository is open-source and available under the MIT License.

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📬 Contact

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! 🚀

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Happy Coding! 🖥️🎯

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