anchor.diff:      | NVL
       | ROUND
       | SUM
  -    ;
  +    ;
positive.code:     ;
  
  database_name
      : regular_id 
      ;
  
  alter_database
  
negative.code: 
  alter_table
      : ALTER TABLE tableview_name
        ( alter_table_properties
        | constraint_clauses
        | column_clauses
  //TODO      | alter_table_partitioning
  //TODO      | alter_external_table
        | move_table_clause
        )
        ((enable_disable_clause | enable_or_disable (TABLE LOCK | ALL TRIGGERS) )+)?
        ';'
  