The following example forms a collection of yachts and uses the
       SUM statement to summarize the prices of yachts in the collection
       and to display the number of yachts built by each builder. Edit
       strings are used to format the values:

       DTR> READY YACHTS; FIND FIRST 6 YACHTS
       [6 records found]
       DTR> SUM 1 ("NUMBER"/"OF YACHTS") USING 9,
       CON>    PRICE USING $$$$,$$$ BY BUILDER

                     NUMBER             NUMBER
       MANUFACTURER OF YACHTS  PRICE   OF YACHTS  PRICE

        ALBERG          1      $36,951
        ALBIN           3      $64,000
        AMERICAN        2      $28,790
                                           6     $129,741

       DTR>