🗄️ 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

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

Example Solution Format

-- 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! 🚀 Happy coding! 🎯