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Understand PostgreSQL comparison functions with examples. Learn num_nulls(), num_nonnulls() & more.

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Description
In this video, we’ll explore Comparison Functions in PostgreSQL — powerful tools that help you analyze and handle null values in your queries.

You’ll learn:
✅ How to use num_nonnulls() to count non-null arguments
✅ How to use num_nulls() to count null arguments
✅ Practical examples of applying these functions to real data
✅ How these functions make data validation and error checking easier
✅ Best practices for handling null values in PostgreSQL

For example:

SELECT num_nonnulls(1, NULL, 2, NULL, 5); -- 3
SELECT num_nulls(1, NULL, 2, NULL, 5); -- 2


By the end of this tutorial, you’ll know how to use PostgreSQL’s comparison functions to write cleaner, safer, and more efficient SQL queries.

📌 This video is part of the PostgreSQL Full Playlist, where we cover operators, functions, and advanced SQL features step by step.

#PostgreSQL #SQL #Database #LearnSQL #Postgres #SQLTutorial #DataEngineering #DatabaseDesign

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