MySQL

MySQL Triggers

1. What is a Trigger? A trigger is a stored database object that automatically executes (fires) when a specified event occurs on a table. Events can be: INSERT UPDATE DELETE 👉...

MySQL Indexes

1. What is an Index? An index is like a book’s index: it helps MySQL find rows faster without scanning the whole table. Technically: it is a data structure (usually B-Tree)...

JOINS in MySQL

👉 A JOIN is used to combine rows from two or more tables based on a related column. Let’s assume we have two tables: Customers id name city 1 John Delhi...

Views in MySQL

1. What is a View? A view is a virtual table created from the result of an SQL query. It does not store data physically, but acts like a table. Useful...

🐬 MySQL Basics

🐬 MySQL Basics 1. What is MySQL? MySQL is an open-source relational database management system (RDBMS). Stores data in tables (rows & columns). Uses SQL (Structured Query Language) to query and...

How to Choose between SQL vs NoSQL databases?

✅ Choose SQL (Relational Database like MySQL, PostgreSQL) when: 1. Structured Data with Clear Schema You have defined tables, relationships, and constraints. Data doesn’t change its structure often. 2. ACID...