How UNION ALL Works in PostgreSQL

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Discover how UNION ALL works in PostgreSQL, how it's different from UNION, and why it's essential when you want to keep duplicates in your results.

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Watch Complete Video - https://youtu.be/ULyuvDFijkE
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Description
In this essential PostgreSQL tutorial, we unravel the true power of the UNION ALL operator! If you’ve ever wondered how to combine multiple query results without losing duplicate rows, this video is exactly what you need.

💡 While UNION removes duplicates by default, UNION ALL keeps them — and that subtle difference can make a huge impact in your SQL logic, performance, and result interpretation.

🔥 What you’ll learn in this video:

What UNION ALL does and how it's different from UNION

Why duplicates might be important in your dataset

Real-life use cases for UNION ALL using Employees and Departments tables

How UNION ALL performs better in large result sets

When and why to choose UNION ALL over UNION

📊 This video includes practical PostgreSQL examples and highlights best practices so you can confidently use UNION ALL in interviews, real projects, or while optimizing SQL workflows.

🎯 Perfect for data analysts, developers, students, and PostgreSQL enthusiasts looking to master set operations.

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#PostgreSQL #SQL #UNIONALL #PostgreSQLTutorial #LearnSQL #SQLTutorial #DataAnalytics #PostgreSQLForBeginners #SetOperators #UnionVsUnionAll #PostgreSQLPerformance #SQLTips #TechEducation

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