https://github.com/vishwas-chakilam/hackerrank-sql-solutions
This repository contains optimized solutions for HackerRank SQL challenges, covering Basic to Advanced SQL concepts. Each solution includes the problem statement, query, and explanation. 📌 Topics: SELECT, Joins, Aggregations, Subqueries, Window Functions & more. 🚀 Perfect for SQL learners & Data Analysts! Star ⭐ the repo if you find it helpful!
https://github.com/vishwas-chakilam/hackerrank-sql-solutions
database mysql query sql
Last synced: 4 months ago
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This repository contains optimized solutions for HackerRank SQL challenges, covering Basic to Advanced SQL concepts. Each solution includes the problem statement, query, and explanation. 📌 Topics: SELECT, Joins, Aggregations, Subqueries, Window Functions & more. 🚀 Perfect for SQL learners & Data Analysts! Star ⭐ the repo if you find it helpful!
- Host: GitHub
- URL: https://github.com/vishwas-chakilam/hackerrank-sql-solutions
- Owner: Vishwas-Chakilam
- Created: 2025-02-08T06:25:19.000Z (4 months ago)
- Default Branch: main
- Last Pushed: 2025-02-16T06:54:57.000Z (4 months ago)
- Last Synced: 2025-02-16T07:25:40.504Z (4 months ago)
- Topics: database, mysql, query, sql
- Homepage:
- Size: 43 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# **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!
---
## 📂 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.
---
## 🚀 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`
---
## 🔧 Prerequisites
Before running the solutions, make sure you have:
✅ A **SQL environment** installed (MySQL, PostgreSQL, SQLite, etc.)
✅ Basic knowledge of **SQL syntax**
---
## 🛠️ How to Use
1. **Clone the repository**
```bash
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
---
## 💡 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.
---
## 🤝 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
---
## 📚 Useful Resources
Here are some great learning materials to help you master SQL:
📌 [SQL Tutorial - W3Schools](https://www.w3schools.com/sql/)
📌 [Mode Analytics SQL Tutorial](https://mode.com/sql-tutorial/)
📌 [LeetCode SQL Questions](https://leetcode.com/problemset/database/)
📌 [PostgreSQL Documentation](https://www.postgresql.org/docs/)
---
## ❓ 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**
---
## 📜 License
This repository is **open-source** and available under the **MIT License**.
---
## 📬 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!** 🚀
---
### **Happy Coding! 🖥️🎯**
---