How to Check if a Column is Null in MySQL

Suppose we want to write a SQL query that checks if a column is NULL in MySQL.

We can write this condition using IS NULL and IS NOT NULL.

SELECT * FROM table_name
WHERE col_name IS NULL;

Empty strings are not considered null in MySQL, but if we want them to be included in our check, we can add that very easily.

SELECT * FROM table_name
WHERE col_name IS NULL OR col_name = '';