What Are NULL Values
What Are NULL Values? - MySQL FAQs - Introduction to SQL Basics
NULL is a special value that represents no value. Here are basic rules about NULL values:
The tutorial exercise shows you some interesting examples:
SELECT 0 IS NULL FROM DUAL; 0 SELECT 0 IS NOT NULL FROM DUAL; 1 SELECT '' IS NULL FROM DUAL; 0 SELECT '' IS NOT NULL FROM DUAL; 1 SELECT NULL IS NULL FROM DUAL; 1 SELECT NULL IS NOT NULL FROM DUAL; 0
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