SQL SELECT Statement SELECT NULL

The SELECT NULL statement is used in SQL to retrieve a NULL value from a table or a database. In this statement, the SELECT keyword is followed by the NULL keyword.

Syntax

The basic syntax for the SELECT NULL statement is as follows:

SELECT NULL;

This statement retrieves a single NULL value.

Example

Let us consider an example. If we want to retrieve all the employee records from the table where the department is NULL, we can use the following query:

SELECT * FROM employees
WHERE department IS NULL;

Output

The output of the query will be all the employee records that do not have a department assigned.

Explanation

The SELECT NULL statement is used when we want to retrieve a NULL value from a table or a database. It can be used to retrieve values from tables that have NULL values in a certain column or columns.

Use

The SELECT NULL statement can be used in various ways, some of which are mentioned below:

• Retrieve a NULL value from a table or database
• Retrieve rows with NULL values in specific columns

Important Points

• The SELECT NULL statement is used to retrieve a NULL value.
• This statement can be used to retrieve values from tables that have NULL values in a certain column or columns.
• The IS NULL operator is used to check if a column has a NULL value.

Summary

In summary, the SELECT NULL statement is used to retrieve a NULL value from a table or database. It is useful in scenarios when we need to retrieve rows with NULL values in specific columns. The IS NULL operator is used to check if a column has a NULL value.