Group By Clause

# Mastering the Group By Clause: Unlock Powerful Data Aggregation in SQL Imagine you're running an online store. You have tons of data about your customers, products, and orders. But raw data is just noise. What you *really* need is insights: Which product category sells the most? What's the average order value per region? How many customers placed more than one order last month? This is where the `GROUP BY` clause in SQL comes to the rescue. It's your secret weapon for summarizing and analyz