In this video, I break down the GROUP BY clause in SQL — what it is, how it works, and why it’s so useful when summarising data. I also walk you through some hands-on examples using a sample payments table, so you can see exactly how GROUP BY works with aggregate functions like SUM, COUNT, AVG, MIN, and MAX.
Here's what I cover:
- A simple explanation of what GROUP BY does
- How it works hand-in-hand with aggregate functions
- Grouping by single and multiple columns
- Real-world examples to make it all click
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