7 Window Functions MASTERED in 17 Minutes | SQL Masterclass

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In this video, I teach you the seven essential SQL window functions that every data professional needs to master for interviews. I cover ROW_NUMBER, RANK, DENSE_RANK, SUM, AVERAGE, LEAD, and LAG with real-world examples that show how to solve common business problems like ranking employees, calculating running totals, and comparing data across time periods. By the end of this 15-minute tutorial, you'll understand not just how these functions work, but when and why to use them in actual data scenarios.

Chapters:
00:00 - Why window functions matter for data interviews
00:50 - What window functions are and how they work
01:53 - ROW_NUMBER function with sales data
03:55 - RANK function and handling ties
05:38 - DENSE_RANK function differences
06:56 - Adding PARTITION BY to ranking functions
08:00 - SUM window function for running totals
10:22 - AVERAGE window function for rolling averages
12:33 - LEAD and LAG functions for time comparisons
16:31 - Next steps for interview preparation

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