Description

   The /SUMMARY qualifier produces a summary report of the selected
   records. The report is directed to the current SYS$OUTPUT device,
   unless you use the /OUTPUT qualifier to write it to a file.

   Summary reports give statistical summaries of the resources
   specified by the /REPORT qualifier for each value of the summary
   key specified by the /SUMMARY qualifier. If you omit the /REPORT
   qualifier, the summary report gives the total number of records
   processed for each summary key value.

   The first line of the summary report shows the time span of the
   data processed (when the first and last records processed were
   logged in the input files), with a title in the middle. You can
   use the /TITLE qualifier to specify your own title.

   The next few lines of the report are column headings. There
   is one column for each summary_item, then one column for each
   resource specified by the /REPORT qualifier. The columns are laid
   out in the same left-to-right sequence as the equivalent keywords
   in the /SUMMARY and /REPORT qualifiers.

   The rest of the report uses one line for each summary key value.
   It gives a summary of the resources associated with that summary
   key value. The data is sorted in ascending order of the summary
   key value.

   See also the /BINARY qualifier, which copies the selected records
   to a file, and the /BRIEF and /FULL qualifiers, which produce
   brief and full reports of the selected records.

   You cannot use the /SUMMARY qualifier with the /BINARY, /BRIEF,
   or /FULL qualifiers.