Question

How to use NULL in MySQL SELECT statement?

Answer 1

Working with NULL Values. The NULL value can be surprising until you get used to it. Conceptually, NULL means “a missing unknown value” and it is treated somewhat differently from other values. ... In MySQL, 0 or NULL means false and anything else means true.

The IS NOT NULL condition is used in SQL to test for a non-NULL value. It returns TRUE if a non-NULL value is found, otherwise it returns FALSE. It can be used in a SELECT, INSERT, UPDATE, or DELETE statement.

With SELECT Statement. ... SELECT * FROM employees WHERE last_name IS NOT NULL; This SQL Server IS NOT NULL example will return all records from the employees table where the last_name does not contain a null value.