Category: MySQL

A subquery (also called a nested query) is simply a query inside another query. It’s like asking a small question to get an answer, and then using that answer to ask the big question....

These built-in functions are like your Swiss Army knife in MySQL. You will use them every single day to clean data, format reports, calculate ages, generate random values, manipulate text, and more. We’ll cover...

Indexes are the secret sauce that makes MySQL queries blazing fast — especially when you have thousands or millions of rows. Today we’ll learn: What indexes really are (with a real-life analogy) How to...

A view is like a virtual table — it doesn’t store any data itself, but it looks and behaves exactly like a real table. It’s basically a saved SELECT query that you can treat...

Now we’ll learn how to save reusable code inside the database itself — like writing your own mini-programs! We have two main concepts today: Stored Procedures → Like mini-programs that can do multiple things...

Triggers and Events are like hidden robots inside MySQL that watch for certain things to happen and then automatically run code for you. Triggers → React to data changes (INSERT, UPDATE, DELETE) Events →...

Transactions are what make MySQL (and any good database) trustworthy — especially when multiple people or programs are using the database at the same time. Today we’ll learn: What ACID really means (why your...

This is the chapter that turns your MySQL database from a “free-for-all playground” into a secure, professional system! In real life, you never want everyone to have full access — imagine if every student...

This is the chapter that saves your life when something goes wrong! No matter how good your code or how careful you are, accidents happen: Server crashes Wrong DELETE without WHERE Hacker attack Disk...

These topics are what separate “good MySQL users” from “excellent, modern, production-ready developers”. They are heavily used in real-world applications (especially in analytics, reporting, APIs, and large-scale systems). We’ll cover each topic with clear...