What is IFNULL?

IFNULL lets you replace NULL values with a specified default value.

IFNULL(expression, replacement_value)

If expression is truthy, it is used. If it’s falsy, the replacement_value is used.

Examples

Example 1: Replace NULL values with 0

SELECT IFNULL(NULL, 0)

Example 2: Replace NULL values with a string

SELECT IFNULL(name, 'Unknown') FROM users;