SQL Window Functions

Course Overview

Welcome to the “Introduction to SQL Window Functions” course!
This comprehensive program is designed to equip you with the knowledge and skills needed to leverage SQL window functions for advanced data analysis. This course provides a robust foundation and practical insights into the powerful world of window functions.

What You Will Learn

Throughout this course, you will gain a thorough understanding of SQL window functions and their applications in real-world scenarios. Here’s a glimpse of what you’ll master:

• Introduction to SQL Window Function:
  Understand the basics and significance of window functions in SQL.
• OVER() and OVER(PARTITION BY):
  Learn how to use these clauses to define the scope of window functions.
• Ranking Functions:
  Explore functions like RANK(), DENSE_RANK(), and ROW_NUMBER() to rank data within partitions.
• Window Frame:
  Delve into defining frames within partitions to calculate running totals, averages, and more.
• Analytics Functions:
  Gain insights into functions such as SUM(), AVG(), and COUNT() used with window functions.
• PARTITION BY / ORDER BY:
  Learn to organize data and set the order within partitions for precise calculations.
• Window Functions – Evaluation Order:
  Understand the sequence in which SQL evaluates window functions.
• More Examples / Queries:
  Apply your knowledge through practical examples, including:
  • Cumulative Sales
  • Moving Average
  • Employee Ranking
  • Year-Over-Year Sales Change
  • Top N Sales by Region