Understand SQL Window Functions with Real-World Examples | SQL Window Function | Top Interview Qs

In this tutorial, I’ll walk you through the most commonly used SQL Window Functions, complete with real-world examples and clear explanations.

📌 What You'll Learn:
✅ What are Window Functions?
✅ How to use ROW_NUMBER(), RANK(), and DENSE_RANK()
✅ Using NTILE() to divide data into buckets
✅ Comparing rows with LAG() and LEAD()
✅ Performing calculations with SUM(), AVG() in a window

We’ll also cover why these functions are different from aggregate functions and how the term “window” plays a key role in their functionality.

📌 Timestamps:
00:00 – Introduction
00:40 – Explaining the Term “Window”
01:30 – What are Window Functions?
03:20 – ROW_NUMBER() Example
04:00 – RANK() and DENSE_RANK() Examples
04:30 – NTILE() Example
06:28 – LAG() and LEAD() Examples
07:32 – SUM(), AVG() Examples
07:55 – Conclusion and Tips

💡 This video is perfect for:

Beginners who want to learn SQL Window Functions step-by-step
Professionals preparing for SQL-related job interviews (frequently asked interview questions!)
Anyone looking to enhance their SQL analytics and reporting skills


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