. 🧠 Part 1: Introduction to SQL (Structured Query Language) 💡 What is SQL? SQL (Structured Query Language) is the standard programming language used to manage and manipulate relational databases. With SQL, you can: Create and modify database structures (schemas) Insert, update, delete, and retrieve data Control access to data (via permissions) Analyze data using aggregation and filtering SQL works with relational database systems like: MySQL PostgreSQL SQLite SQL Server Oracle SQL commands are grouped into five major categories: Category Description Example DDL (Data Definition Language) Defines database structure CREATE , ALTER , DROP DML (Data Manipulation Language) Deals with data modification INSERT , UPDATE , DELETE DQL (Data Query Language) Fetches data SELECT TCL (Transaction Control Language) Manages transactions COMMIT , ROLLBACK DCL (Data Control Language) Manages access rights GRANT , REVOKE Part 2: Data Definition Language (DDL...