> NULL Summary Table: Concept Rule What is NULL Absence of any value NULL = NULL FALSE - never equal NULL = 0 FALSE - completely different Check for NULL Use IS NULL / IS NOT NULL Math with NULL Always results in NULL Replace NULL Use NVL() function NULL in ASC orderAppears LAST NULL in DESC orderAppears FIRST #OracleSQL #NullValues #NVL #IsNull #COALESCE #LearnSQL #SQLBeginners #Day9 #100DaysOfCode #TechTwitter