How to use the IFNULL function in SQL?

The IFNULL function is used to replace null values with a specified value. Its syntax is as follows:

IFNULL(expression, replacement_value)

With that, the expression is the expression to be checked, and if the value of the expression is NULL, then the replacement_value is returned. For example:

SELECT IFNULL(column_name, 'N/A') FROM table_name;

This will check the values in the column_name column, and if the value is NULL, it will return N/A.