26.4.5.20 The version_major() Function
          This function returns the major version of the MySQL server.
        
            A TINYINT UNSIGNED value.
          
mysql> SELECT VERSION(), sys.version_major();
+------------------+---------------------+
| VERSION()        | sys.version_major() |
+------------------+---------------------+
| 5.7.24-debug-log |                   5 |
+------------------+---------------------+