SQL lecture - 16 | MySQL Sub- Query Part - I | NMD Pvt Ltd

Mastering MySQL Subqueries: Part 1 – Understanding the Basics

In this video, we introduce subqueries, a powerful feature in MySQL that allows you to use one query inside another. Subqueries enable advanced data manipulation, filtering, and calculations, making your SQL queries more dynamic and efficient.

We’ll cover:

What is a Subquery?
Definition and purpose of subqueries in MySQL
The difference between subqueries and joins
Types of subqueries:
Scalar Subqueries: Returning a single value
Column Subqueries: Returning one column of multiple rows
Row Subqueries: Returning a single row
Table Subqueries: Returning multiple rows and columns
Using Subqueries in SELECT
How to use subqueries to calculate values dynamically
Practical example: Finding the average score of a class and comparing individual student scores
Using Subqueries in WHERE
Filtering data using subqueries
Practical example: Selecting employees with salaries higher than the average salary
Using Subqueries in FROM
Treating subquery results as a temporary table
Practical example: Analyzing sales data grouped by regions
Best Practices and Optimization
Writing efficient subqueries to avoid performance issues
When to use subqueries vs. joins for better performance and clarity
Understanding correlated vs. non-correlated subqueries
This lecture is perfect for beginners and intermediate learners who want to understand the basics of subqueries and how to use them effectively.

📌 What you'll learn:

The fundamentals of subqueries and their types
How to use subqueries in SELECT, WHERE, and FROM clauses
Practical examples to apply subqueries in real-world scenarios
Tips for writing clean and optimized subqueries
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