26.4.5.22 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() |
+------------------+---------------------+
| 5.7.24-debug-log | 24 |
+------------------+---------------------+