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Showing content from https://mariadb.com/docs/server/reference/sql-structure/operators/comparison-operators/is-not below:

IS NOT | MariaDB Documentation

1. Reference
2. SQL Structure
3. Operators
4. Comparison Operators

Tests a value against a boolean value, where boolean_value can be TRUE, FALSE, or UNKNOWN.

SELECT 1 IS NOT UNKNOWN, 0 IS NOT UNKNOWN, NULL IS NOT UNKNOWN;
+------------------+------------------+---------------------+
| 1 IS NOT UNKNOWN | 0 IS NOT UNKNOWN | NULL IS NOT UNKNOWN |
+------------------+------------------+---------------------+
|                1 |                1 |                   0 |
+------------------+------------------+---------------------+

SELECT NULL IS NOT TRUE, NULL IS NOT FALSE;
+------------------+-------------------+
| NULL IS NOT TRUE | NULL IS NOT FALSE |
+------------------+-------------------+
|                1 |                 1 |
+------------------+-------------------+

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