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:     | SET ANSI_NULLS on_off
      | SET QUOTED_IDENTIFIER on_off
      | SET ANSI_PADDING on_off
      ;
  
  constant_LOCAL_ID
      : constant
  