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MySQL | IS NOT

Database
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MySQL
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Documentation
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Operators
schedule Jul 1, 2022
Last updated
local_offer MySQL
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MySQL's IS NOT operator performs a test against a boolean value and returns 0 if the test evaluates to true, otherwise it returns 1.

NOTE

The boolean value to test against can be one of: TRUE, FALSE, UNKNOWN

Syntax

SELECT value IS NOT TRUE|FALSE|UNKNOWN;

Example

To check whether 'test' is not TRUE:

SELECT 'test' IS NOT TRUE;
+--------------------+
| 'test' IS NOT TRUE |
+--------------------+
| 1 |
+--------------------+

As 'test' is FALSE, the test whether 'test' is not TRUE evalutes to true, resulting in return value 1.

To check whether 1 is not TRUE:

SELECT 1 IS NOT TRUE;
+---------------+
| 1 IS NOT TRUE |
+---------------+
| 0 |
+---------------+

As 1 is TRUE, the test whether 1 is not TRUE evalutes to false, resulting in return value 0.

To check whether NULL is not UNKNOWN:

SELECT NULL IS NOT UNKNOWN;
+---------------------+
| NULL IS NOT UNKNOWN |
+---------------------+
| 0 |
+---------------------+

As NULL evaluates to UNKNOWN, the test whether NULL is not UNKNOWN evalutes to false, resulting in return value 0.

robocat
Published by Arthur Yanagisawa
Edited by 0 others
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