You’re Using GROUP BY Wrong – Here’s What You Missed!

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Learn how to use GROUP BY with multiple columns in PostgreSQL using real-world examples and powerful SQL tips.

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Watch Complete Video - https://youtu.be/M67DJEIy6Jk
Blog - https://knowledge360blog.blogspot.com/2025/04/the-group-by-and-having-clauses-queries.html
Notes - https://drive.google.com/file/d/1ONTT3BD8MVsOAUT65QhxZ-TjOr93Raui/view?usp=sharing

Description
Unlock the true power of the GROUP BY clause by learning how to use it with multiple columns in PostgreSQL. In this step-by-step tutorial, you'll discover how to summarize data more effectively and uncover patterns hidden in your datasets.

We break down simple and advanced examples—from grouping employee salaries by department and salary levels to analyzing product sales using multiple fields. Plus, you'll learn about ROLLUP, CUBE, and GROUPING SETS to create dynamic reports with just a few lines of SQL.

📘 This tutorial covers:

GROUP BY with two or more columns

Aggregating data using SUM, COUNT, AVG

Practical PostgreSQL queries

Filtering groups with HAVING

Real-world examples from HR and e-commerce datasets

Advanced grouping techniques for deeper insights

If you've only been using single-column GROUP BYs, you’re missing out! Watch this video to step up your SQL game.

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