Notes - Yosunnyvim https://yosunnyvim.me/logo_hu_2f64bab10613c3d8.png https://yosunnyvim.me/logo_hu_2f64bab10613c3d8.png Mohamed Younis Hugo 2026-09-06T00:00:00Z urn:uuid:7b0a365b-fac6-5d2c-89e1-0fc0b2911802 <![CDATA[SQL]]> 2025-10-25T00:00:00Z 2025-10-25T00:00:00Z urn:uuid:faa7caf0-6d45-5ca5-895a-bc63eda80820 Chapter 1 — Database Basics

What is a Database?

A database is a structured system to store, manage, and retrieve data efficiently.

SQL (Relational Databases)

  • Data stored in tables (rows & columns)
  • Fixed schema
  • Uses SQL
  • Strong data integrity and relationships
  • Best for structured data

Examples:

  • PostgreSQL
  • MySQL
  • SQLite

NoSQL (Non-Relational Databases)

  • Flexible data formats (JSON, key-value, graph)
  • No fixed schema
  • Designed for scalability and speed
  • Can cause data duplication

Examples:

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