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https://github.com/cyberoctane29/hackerrank-sql-problem-solving

This repository includes my SQL problem-solving approach and solutions to HackerRank challenges, organized by difficulty level: Easy, Medium, and Hard. Each challenge has its own solution file with clear explanations to make the reasoning easy to follow. I aim to share my thought process, logic, and approach behind each answer.
https://github.com/cyberoctane29/hackerrank-sql-problem-solving

hackerrank hackerrank-solutions mysql sql

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This repository includes my SQL problem-solving approach and solutions to HackerRank challenges, organized by difficulty level: Easy, Medium, and Hard. Each challenge has its own solution file with clear explanations to make the reasoning easy to follow. I aim to share my thought process, logic, and approach behind each answer.

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README

        

# πŸ—„οΈ HackerRank SQL Problem Solving

Welcome to my **HackerRank SQL Problem Solving** repository!

This repository contains my SQL problem solving approach and solutions to HackerRank challenges, systematically categorized by difficulty level:

- **Easy**
- **Basic**
- **Intermediate**
- **Advanced**
- **Medium**
- **Basic**
- **Intermediate**
- **Advanced**
- **Hard**
- **Intermediate**
- **Advanced**

Each problem has its own dedicated SQL file, which includes:

- **Problem Explanation** – A brief overview of the problem statement.
- **Solution Intuition** – The thought process and reasoning behind the approach taken.
- **SQL Query** – A well-structured solution to the problem.
- **Alternative Solutions** (if applicable) – Some problems feature multiple solutions for optimization or to explore different approaches.

## Why This Repository?

This collection serves as a structured reference for:

- Learning **SQL techniques** through real-world problems.
- Understanding different ways to solve SQL queries efficiently.
- Exploring **query optimizations** and alternative methods for better performance.
- Gaining insights into **SQL patterns** commonly used in technical interviews.

## Repository Structure

```sql
-- Hackerrank-SQL-Solutions/
-- │── Easy/
-- β”‚ β”œβ”€β”€ Easy-Basic/
-- β”‚ β”‚ β”œβ”€β”€ problem_name_1.sql
-- β”‚ β”‚ β”œβ”€β”€ problem_name_2.sql
-- β”‚ β”œβ”€β”€ Easy-Intermediate/
-- β”‚ β”‚ β”œβ”€β”€ problem_name_3.sql
-- β”‚ β”‚ β”œβ”€β”€ problem_name_4.sql
-- β”‚ β”œβ”€β”€ Easy-Advanced/
-- β”‚ β”‚ β”œβ”€β”€ problem_name_5.sql
-- β”‚ β”‚ β”œβ”€β”€ problem_name_6.sql
-- │── Medium/
-- β”‚ β”œβ”€β”€ Medium-Basic/
-- β”‚ β”‚ β”œβ”€β”€ problem_name_7.sql
-- β”‚ β”‚ β”œβ”€β”€ problem_name_8.sql
-- β”‚ β”œβ”€β”€ Medium-Intermediate/
-- β”‚ β”‚ β”œβ”€β”€ problem_name_9.sql
-- β”‚ β”‚ β”œβ”€β”€ problem_name_10.sql
-- β”‚ β”œβ”€β”€ Medium-Advanced/
-- β”‚ β”‚ β”œβ”€β”€ problem_name_11.sql
-- β”‚ β”‚ β”œβ”€β”€ problem_name_12.sql
-- │── Hard/
-- β”‚ β”œβ”€β”€ Hard-Intermediate/
-- β”‚ β”‚ β”œβ”€β”€ problem_name_13.sql
-- β”‚ β”‚ β”œβ”€β”€ problem_name_14.sql
-- β”‚ β”œβ”€β”€ Hard-Advanced/
-- β”‚ β”‚ β”œβ”€β”€ problem_name_15.sql
-- β”‚ β”‚ β”œβ”€β”€ problem_name_16.sql
```

## Example Solution Format

```sql
-- Problem: [Problem Title]
-- Difficulty: [Easy/Medium/Hard]

-- SQL Schema
-- Table: [Table Name]
-- +-------------+---------+
-- | Column Name | Type |
-- +-------------+---------+
-- | column_1 | type |
-- | column_2 | type |
-- +-------------+---------+
-- [Primary key and other constraints]

-- Problem Statement
-- [Provide a brief problem description.]

-- Solution:
-- [Explain the approach used in the solution.]

SELECT column_1, column_2
FROM TableName
WHERE some_condition;

-- Intuition:
-- [Describe the core idea behind solving this problem. Explain the thought process used to arrive at the solution.]

-- Explanation:
-- [Explain why this approach works effectively and break down the logic of the code step by step.]
```

Whether you're just starting with SQL or looking to refine your skills, I hope this resource helps you tackle real-world problems and improves your problem-solving ability.

Let’s learn and grow together! πŸš€ Happy coding! 🎯