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MariaDB: IS NOT NULL

This MariaDB tutorial explains how to use the MariaDB IS NOT NULL condition with syntax and examples.

Description

The MariaDB IS NOT NULL condition is used to test for a NOT NULL value in a SELECT, INSERT, UPDATE, or DELETE statement.

Syntax

The syntax for the IS NOT NULL condition in MariaDB is:

expression IS NOT NULL

Parameters or Arguments

expression
The value to test whether it is a non-NULL value.

Note

  • If expression is NOT a NULL value, the condition evaluates to TRUE.
  • If expression is a NULL value, the condition evaluates to FALSE.
  • See also the IS NULL condition in MariaDB.

Example - With SELECT Statement

Let's look at an example of how to use the IS NOT NULL condition in a SELECT statement in MariaDB.

For example:

SELECT *
FROM sites
WHERE site_name IS NOT NULL;

This IS NOT NULL example will return all records from the sites table where the site_name does not contain a NULL value.

Example - With INSERT Statement

Let's look at how to use the IS NOT NULL condition in an INSERT statement in MariaDB.

For example:

INSERT INTO contacts
(contact_id, contact_name)
SELECT site_id, site_name
FROM sites
WHERE site_name = 'TechOnTheNet.com'
AND server_name IS NOT NULL;

This MariaDB IS NOT NULL example will insert records into the sites table where the site_name is 'TechOnTheNet.com' and the server_name contains does not contain a NULL value.

Example - With UPDATE Statement

Let's look at an example in MariaDB of how to use the IS NOT NULL condition in an UPDATE statement.

For example:

UPDATE sites
SET server_name = 'MyServer'
WHERE site_name IS NOT NULL;

This IS NOT NULL example will update records in the sites table where the site_name does not contain a NULL value.

Example - With DELETE Statement

Let's look at an example of how to use the IS NOT NULL condition in a DELETE statement in MariaDB.

For example:

DELETE FROM sites
WHERE server_name IS NOT NULL;

This MariaDB IS NOT NULL example will delete all records from the sites table where the server_name does not contain a NULL value.

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