Understanding NULL Values in SQL: Overview
Module: Foundational Concepts
Understand what NULL represents
Master three-valued logic (TRUE, FALSE, UNKNOWN)
Handle NULL in WHERE, JOINs, aggregations
Use IS NULL, COALESCE() effectively
Understand what NULL represents
Master three-valued logic (TRUE, FALSE, UNKNOWN)
Handle NULL in WHERE, JOINs, aggregations
Use IS NULL, COALESCE() effectively