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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