SQL Keyword - IS NULL

The IS NULL keyword is used to test for empty values (NULL values) in a column.

Syntax

SELECT <COLUMNS> FROM <TABLE_NAME> WHERE <COLUMN> IS NULL;

Example

SELECT * FROM Employee WHERE Emp_Hobby IS NULL;

SQL Keyword - IS NOT NULL

The IS NOT NULL keyword is used to test non-empty values (NOT NULL values) in the column.

Syntax

SELECT <COLUMNS> FROM <TABLE_NAME> WHERE <COLUMN> IS NOT NULL;

Example

SELECT * FROM Employee WHERE Emp_Hobby IS NOT NULL;

The IS NULL keyword is used to evaluate a column for NULL values, or empty values.