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What is Row Number Function in SQL?
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Chapters:

00:06 What is the ROW_NUMBER Function in SQL?
00:11 Purpose and Basics of the ROW_NUMBER Function in SQL
00:17 How ROW_NUMBER Works: Unique Row Assignment in SQL
00:24 ROW_NUMBER vs. RANK and DENSE_RANK in SQL
00:32 Handling Tied Values in ROW_NUMBER in SQL
00:37 Practical Example: ROW_NUMBER Function in Action in SQL
00:44 Using PARTITION BY Clause with ROW_NUMBER in SQL
00:49 How ROW_NUMBER Handles Duplicates Differently in SQL
00:55 Practical Demonstration and Results
01:02 Comparing ROW_NUMBER, RANK, and DENSE_RANK in SQL
01:05 Observations on Handling Tied Values
01:14 Application of ROW_NUMBER in Different Regions in SQL
01:24 Conclusion and Summary

Today, we will discuss the Row Number function. The Row Number function is a window function that assigns a unique integer to each row within a result set based on the specified order in the ORDER BY clause. Unlike RANK and DENSE_RANK, Row Number does not handle tied values, giving each row a distinct number.

When using RANK or DENSE_RANK, duplicate values receive the same rank. For example, if two rows have the value 89 and the rank is 5, both will be ranked 5. In contrast, Row Number assigns unique numbers, so the first 89 gets 5, and the second 89 gets 6.

In practice, Row Number performs ranking without duplicates, restarting the numbering for each partition specified in the PARTITION BY clause. For instance, when switching from the East to the North region, the numbering starts anew due to the window function partitioning by region.

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