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Using ORDER BY in UNION — The Clean Way 🔗

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Learn how to sort results from UNION queries in PostgreSQL using ORDER BY correctly. Sort by output columns the clean and proper way.

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Watch Complete Video - https://youtu.be/EHO_gO_owKQ
Blog - https://knowledge360blog.blogspot.com/2025/05/order-by-in-postgresql-queries-sorting.html
Notes - https://drive.google.com/file/d/1GtJhZTlHSWuNhOlS1So5aWFmACWYodzx/view?usp=sharing

Description
In this PostgreSQL tutorial, we break down a common confusion: how to use ORDER BY with UNION queries. When combining results from multiple queries, many developers mistakenly try to sort using table columns or expressions—which leads to errors.

PostgreSQL requires that when you use ORDER BY after a UNION, you can only sort by output column names or numbers, not raw expressions or source table columns.

In this video, you’ll learn:

How UNION works and when to use it

Correct syntax for ORDER BY in a UNION

Why sorting by column position (e.g., ORDER BY 1) is required

Real-world examples using employee department queries

How to avoid common errors like “column does not exist”

📌 Example:

SELECT first_name FROM employees WHERE department = 'HR'
UNION
SELECT first_name FROM employees WHERE department = 'Engineering'
ORDER BY 1;

💡 If you're working with merged datasets, reports, or analytics, mastering ORDER BY with UNION is essential to keep your results consistent and readable.

#PostgreSQL #SQL #OrderBy #UNIONQuery #SQLUNION #PostgreSQLTutorial #LearnSQL #SQLTips #PostgreSQLExamples #OrderByInUnion #BackendDevelopment #DataEngineering #CleanSQL

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