26.4.5.21 The version_minor() Function
          This function returns the minor version of the MySQL server.
        
            A TINYINT UNSIGNED value.
          
mysql> SELECT VERSION(), sys.version_minor();
+------------------+---------------------+
| VERSION()        | sys.version_minor() |
+------------------+---------------------+
| 5.7.24-debug-log |                   7 |
+------------------+---------------------+