anchor.diff:      | derived_table
       | execute_statement
       | DEFAULT VALUES
  -    ;
  +    ;*/
   
   // https://msdn.microsoft.com/en-us/library/ms189499.aspx
   select_statement
       : with_expression? query_expression order_by_clause? for_clause? option_clause? ';'?
  -    ;
  +    ;/*
   
   // https://msdn.microsoft.com/en-us/library/ms177523.aspx
   update_statement
  
positive.code: /* Will visit later
  database_mirroring_option:
       ALTER DATABASE Database Mirroring
      ;
  */
  
  date_correlation_optimization_option:
      DATE_CORRELATION_OPTIMIZATION on_off
      ;
  
  
negative.code:     | ROLLBACK WORK? ';'?
      // https://msdn.microsoft.com/en-us/library/ms188378.aspx
      | SAVE (TRAN | TRANSACTION) (id | LOCAL_ID)? ';'?
      ;*/
  
  // https://msdn.microsoft.com/en-us/library/ms188037.aspx
  go_statement
      : GO (count=DECIMAL)?
      ;/*
  
  // https://msdn.microsoft.com/en-us/library/ms188366.aspx
  use_statement
  