GROUP BY and HAVING Clauses in PostgreSQL || Queries in PostgreSQL || PostgreSQL Full Playlist #34

Pubblicato il: 01 aprile 2025
sul canale di: Knowledge 360
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Learn how to use the GROUP BY and HAVING clauses in PostgreSQL to group and filter aggregated data effectively. Perfect for reporting and analysis!

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Description
Master the GROUP BY and HAVING clauses in PostgreSQL with real-world examples! 🚀

In this tutorial, we explore how GROUP BY helps in summarizing data and how HAVING filters the grouped results. These SQL clauses are crucial for data analysis, reporting, and decision-making.

🔹 What You’ll Learn in This Video?
✔️ How GROUP BY organizes data into meaningful groups
✔️ Using aggregate functions like SUM(), COUNT(), AVG() with GROUP BY
✔️ Applying HAVING to filter grouped results
✔️ Practical examples with employee salary analysis & online order revenue calculations

💻 Example Queries Used in This Video:

📌 Employee Salary Analysis
Calculate total salary per department
Count employees in each department

📌 Online Orders Revenue Analysis
Find total revenue per product
Filter high-revenue products using HAVING

📚 Sample Query – Total Revenue per Product
SELECT product, SUM(quantity * price) AS total_revenue
FROM orders
GROUP BY product;

🔥 Ready to level up your SQL skills? Watch the full tutorial and practice along!
📢 Next Video: GROUPING SETS, CUBE, and ROLLUP in PostgreSQL
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📌 Chapters Covered:
00:00 - Introduction
00:45 - Simple Group BY Examples
01:50 - Multiple Columns In Group BY
02:45 - Simple Having Clause Example
03:38 - Complex Having Clause Example
04:19 - Conclusion


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