30.4.5.22 The version_patch() Function
This function returns the patch release version of the MySQL
server.
A TINYINT UNSIGNED
value.
mysql> SELECT VERSION(), sys.version_patch();
+--------------+---------------------+
| VERSION() | sys.version_patch() |
+--------------+---------------------+
| 8.0.26-debug | 26 |
+--------------+---------------------+