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#SQL

🗂️ SQL-Notes-and-Queries

This repository is a collection of SQL notes, queries, and practice problems designed to help you learn and revise SQL effectively. Whether you're a beginner or preparing for interviews, this repo covers essential SQL concepts with examples and hands-on exercises.

📌 What’s Included

  • 📒 Topic-wise Notes
    Covers core SQL topics such as:

    • DDL (CREATE, ALTER, DROP)
    • DML (INSERT, UPDATE, DELETE)
    • SELECT Queries
    • WHERE, GROUP BY, HAVING, ORDER BY
    • JOINS (INNER, LEFT, RIGHT, FULL)
    • Subqueries & Nested Queries
    • Constraints (Primary Key, Foreign Key, NOT NULL, UNIQUE)
    • Views & Indexes
    • Transactions and ACID properties

  • 🧠 Practice Queries

    • Simple to advanced level queries
    • Real-world scenarios
    • Query optimization examples

  • 🧪 Sample Database Schemas

    • Ready-to-use schemas for testing queries

  • 🧾 Interview Questions

    • Common SQL interview questions with answers
    • Query-based coding challenges

🛠️ Tools

  • ✅ Compatible with MySQL, PostgreSQL, and SQLite
  • 📂 SQL files organized by topic for easy access

🎯 Ideal For

  • Students preparing for placement & interviews
  • Beginners starting with SQL
  • Developers revising SQL concepts
  • Anyone exploring relational databases