UNION vs UNION ALL Simplified | Real-World SQL Use Case
Confused between UNION and UNION ALL in SQL? 🤔 You're not alone! In this quick and practical video, we break down the exact difference between these two keywords — and show you when and why to use each with a real-world data engineering scenario.
🎯 What you’ll learn:
The core difference between UNION and UNION ALL
How duplicate handling works behind the scenes
Performance implications in large datasets
A practical SQL example used in real projects
Whether you're prepping for an interview or writing production-level SQL, this concept is crucial for clean and efficient queries.
🧠 Ideal for: Data Engineers, Analysts, SQL Beginners, and Interview Prep
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