Master SQL Subqueries | Single-row | Multi-row | Correlated | Uncorrelated Subqueries
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In this tutorial, we dive deep into SQL Subqueries - what they are, the different types, real-world examples, and most importantly, how to write efficient subqueries that boost your database performance!
Notes: https://github.com/nakulmitra/databas...
What You’ll Learn:
What are Subqueries in SQL?
Types of Subqueries: Single-row, Multi-row, Correlated, and Uncorrelated
Practical Examples Explained
How to Optimize Subqueries for Faster Performance
Common Mistakes to Avoid with Subqueries
Key Concepts Covered:
Using subqueries to filter, aggregate, and transform data
Real-world SQL use cases
Sample Queries Included:
Find employees earning above average salary
List departments based on salary conditions
Correlated subqueries example
Aggregating results with nested subqueries
Timestamp:
00:00 - Introduction
00:17 - What are Subqueries?
02:23 - Single-row Subquery
03:13 - Multi-row Subquery
05:59 - Correlated Subquery
09:25 - Uncorrelated Subqueries (Using Subqueries with Aggregates)
14:50 - Writing Efficient Subqueries
15:42 - Common Mistakes to Avoid
16:19 - Summary
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