LeetCode SQL 50 This repository contains all my accepted solutions for the LeetCode SQL 50 🚀 Getting Started

Prerequisites

• Basic understanding of SQL syntax
• Access to a SQL database system (MySQL, PostgreSQL, SQLite, etc.)
• SQL client or online SQL playground

Usage

1. Clone the repository:

git clone https://github.com/PacemakerX/leetCode-my-solutions-sql-50.git
cd leetCode-my-solutions-sql-50

2. Browse solutions:

• Each file is named questionX_YYYY.sql where X is the question number and YYYY is the LeetCode problem ID
• Open any .sql file to view the solution
• Solutions include comments explaining the approach

3. Test solutions:

• Copy the SQL code to your preferred SQL environment
• Use the sample data provided in LeetCode problem descriptions
• Verify results match expected outputs

📁 Repository Structure

├── README.md                 # This file
├── question1_1757.sql        # Recyclable and Low Fat Products
├── question2_584.sql         # Find Customer Referee
├── question3_595.sql         # Big Countries
├── question4_1148.sql        # Article Views I
├── question5_1683.sql        # Invalid Tweets
└── ... (more solutions)

study plan, organized by question number and problem ID. It's a comprehensive collection focusing specifically on SQL database problems to help master essential SQL concepts and techniques.

📋 About SQL 50

The LeetCode SQL 50 is a curated list of essential SQL problems that cover fundamental database concepts including:

• Select & Basic Filtering
• Joins (Inner, Left, Right, Full Outer)
• Aggregate Functions (COUNT, SUM, AVG, MIN, MAX)
• Subqueries & CTEs
• Window Functions
• String Functions
• Date/Time Operations
• Advanced SQL Techniques

🎯 Why This Repository?

This repository serves as:

• SQL Mastery: A systematic approach to learning essential SQL concepts
• Interview Preparation: Perfect for preparing SQL questions commonly asked in technical interviews
• Reference Guide: Quick access to SQL patterns and techniques
• Learning Resource: Clean, commented solutions for SQL beginners and intermediate learners
• Progress Tracking: Personal archive of SQL 50 completion journey

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