Скачать или смотреть Day 15: What Is a Database? SQL vs NoSQL Explained Simply

Databases store everything — from your Instagram photos to bank transactions and UPI payments.

Welcome to Day 15 of the 100 Days of Tech series! 🚀

Today we break down:

What exactly a database is

Why we need databases

The difference between SQL and NoSQL databases

Where each is actually used in real life

🗄️ What Is a Database?

A database is a system that stores, organizes, and manages data so apps can access it efficiently.

🧠 SQL vs NoSQL (Simple Explanation)
SQL Databases (Structured)

Organized in rows and columns (like Excel)

Follow strict rules (Schema)

Great for transactions and consistency

Examples:
✔ MySQL
✔ PostgreSQL
✔ Oracle
✔ SQL Server

NoSQL Databases (Flexible)

Stores data in JSON-like format

No fixed structure

Great for large scale data

Examples:
✔ MongoDB
✔ Cassandra
✔ Firebase
✔ DynamoDB

📌 Where are they used?

✔ SQL is best for:

Banking

UPI

Inventory systems

E-commerce orders

✔ NoSQL is best for:

Instagram posts

YouTube comments

Real-time analytics

Large AI datasets

💡 Bottom Line:

SQL = Structured, safe, transactional
NoSQL = Flexible, scalable, fast for large data

⏱️ Chapters:

00:00 — Intro
00:20 — What is a Database?
01:10 — SQL Explained
02:40 — NoSQL Explained
04:00 — SQL vs NoSQL Comparison
05:20 — Real-Life Examples
06:00 — Day 16 Preview

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