NULL Handling with COALESCE

How do we handle missing or NULL values cleanly with default fallbacks?

Advanced⏱ 3 Minutes⭐ 470 XP

🤔 THE QUESTION

How do we handle missing or NULL values cleanly with default fallbacks?

💡 WHAT IS IT?

COALESCE returns the first non-NULL expression from its argument list.

🎯 WHAT IS IT USED FOR?

Data sanitization, preventing NULL propagation in reports, default text fallbacks.

💻 EXAMPLE

SELECT
name,
COALESCE(department, 'Not Assigned')
AS department
FROM employees;

Practice typing production-grade SQL code for NULL Handling with COALESCE.