Click above to get retro games delivered to your door ever month!

   Another options available is for specifying the Unique attribute of an
   index. For instance, in a customers file, more persons with the same
   lastname can be stored. If the index is created on the lastname, it will
   yield duplicate entries. With the unique attribute turned on, only the
   first occurrence will be stored, all the others will not be added to the
   index. The unique attribute is maintained whenever the files is updated or
   reindexed.

   Two possibilities are permitted:

     . No. The index has no unique attribute and allows for
       duplicate entries. This is the default value.

     . Yes. The index has the unique attribute turned on.