Why 90% Get GROUP BY Totally Wrong
Key Takeaways
Explains the difference between GROUP BY and window functions in SQL, with examples and use cases
Full Transcript
I used to write everything with group by then I discovered window functions and everything changed. I've been working with SQL for years and this is one of the most common mistakes I see confusing group by with window function. Let me clear it up. Group by gives you one row per group. If you group by department, you get one row per department. For example, you get average salary per department, but no employee names. Useful for totals, but you lose the original details. Window functions don't remove rows. They just add extra insights like show each employee and also the average salary of their department. For example, you get full details and insights together. Group by gives you a summary. Window functions let you compare without losing data. Group by is a compressed view. Window Functions is a detailed view with summary added. Want to master window functions the right way? My book, Mastering SQL Window Functions, is on a special discount right now. You can buy it right now. The link is in the print comment.
Original Description
Still stuck using only GROUP BY in SQL?
That used to be me… until I discovered window functions—and everything changed.
In this video, I’ll show you the #1 mistake most SQL learners (and even pros!) make: confusing GROUP BY with window functions.
I'll explain each step with simple, relatable examples and when to use each so you can write more powerful, flexible queries.
✅ Learn the difference in just a few minutes
✅ Avoid common interview mistakes
✅ Upgrade your SQL mindset
If you’re serious about mastering window functions correctly, my book ‘SQL Window Functions’ is now on special discount.
In this video, we'll dive into the world of SQL and explore the key differences between GROUP BY and Window Functions. Both are used to perform aggregations and analyze data, but they serve distinct purposes and have different use cases. We'll examine the syntax, examples, and scenarios where one is more suitable than the other. By the end of this video, you'll have a clear understanding of when to use GROUP BY and when to use Window Functions, making you a more efficient and effective SQL developer. Whether you're a beginner or an experienced developer, this video will help you take your SQL skills to the next level.
🎯 Level up with my book 'Mastering SQL Windows Functions'—get your copy today! 📘💡https://dataprofy.com/product/mastering-sql-windows-functions/
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