CREATE ROLE ---> <role-name> ----------------------+
  +---------------------<----------------------------+
  +-----+--------------------------------+-----------+
        +--> IDENTIFIED EXTERNALLY ------+           |
        +--> NOT IDENTIFIED -------------+           |
  +--------------------<-----------------------------+
  +-----+----------------------------------+----------->
        +--> COMMENT IS --+-> 'string' --+-+
                          +------ / <----+