Library /sys$common/syshlp/DTRHELP.HLB  —  Commands Statements Clauses, REDUCE Statement
       Retains only the unique field values or combinations of field
       values in a DEC DATATRIEVE collection, dropping all other values,
       depending on the reduce key or keys specified.

       Format

         REDUCE  [collection-name]  TO  reduce-key-1  [,...]
Additional Information: explode extract
Arguments Examples
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