Complete SQL Course Repository

This repository contains a comprehensive collection of SQL queries, covering everything from basic operations to advanced techniques. The queries are organized to provide a structured learning experience, suitable for beginners as well as experienced developers.

Course Contents

1. Introduction to SQL

   • Basic SQL syntax
   • Selecting data
   • Filtering data with WHERE clauses

2. Working with Multiple Tables

   • JOIN operations (INNER, LEFT, RIGHT, FULL)
   • Self-joins and subqueries
   • Cross joins (Cartesian products)

3. Aggregations and Grouping

   • COUNT, SUM, AVG, MIN, MAX
   • GROUP BY and HAVING clauses

4. Advanced SQL Techniques

   • Window functions
   • Common Table Expressions (CTEs)
   • Recursive queries

5. Database Management

   • Creating and modifying tables
   • Indexes and constraints
   • Transactions and concurrency control

6. Practical Examples and Exercises

   • Real-world scenarios
   • Query optimization tips
   • Practice exercises

How to Use This Repository

• Learning: Follow the course content in the provided order to build your SQL skills step-by-step.
• Reference: Use individual queries as examples or templates for your projects.
• Practice: Try out the provided exercises and compare your results with the solutions.

Prerequisites

• A working SQL environment (e.g., MySQL, PostgreSQL, SQL Server).
• Access to sample databases like Northwind, Pubs, or any other relevant databases.

Contribution

Contributions are welcome! If you have additional queries or improvements, please submit a pull request.