Using ORDER BY with PostgreSQL Window Functions

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Understand how ORDER BY works inside PostgreSQL window functions to control row processing, ranking, running totals, and analytics.

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Description
Did you know that adding ORDER BY inside a PostgreSQL window function can completely change how your query behaves? In this video, we’ll deep dive into the power of ORDER BY within window functions, and show how it impacts results like running totals, rankings, and frame-based calculations.

You’ll learn how PostgreSQL evaluates rows using both PARTITION BY and ORDER BY, how to write cumulative aggregates (like running totals), and why you should always be explicit about your ORDER BY clause to avoid unexpected results.

💡 Through hands-on examples, we’ll cover:

Cumulative sums using ORDER BY

The difference between using ORDER BY vs. not using it

How ranking changes based on order

How PostgreSQL sorts rows internally

Why explicit ORDER BY is crucial for predictable output

Performance tips with indexing and frame specification

This is a must-watch for SQL learners, analysts, and data engineers looking to level up their PostgreSQL window function skills. Perfect for interview prep, project work, or daily analytics!

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