The Art of PostgreSQL/

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Challenge: Understanding Nulls

Challenge: Understanding Nulls

Try a hands-on exercise to test your knowledge and understanding of NULLs.

We'll cover the following...

Problem statement

In this challenge, you will complete two tasks to test your knowledge and understanding of null in SQL.

Task 1

Programming languages come with a special value for null values. SQL deals with such values differently than other languages because it provides a three-valued logic for nulls. Let’s check the behavior of null with the values true, false ...