Answer Posted / vp86

unique keyword is file level keyword you can use physical file as well as logical file also if you use the unique keyword then you prevent the duplicate value in particular filed and one more necessary condition file should be keyd.

pfile : That keyword is logical file keyword its record level keyword through we can create the logical file .

syntax for that keyword : pfile(physical file name).

ref: this keyword is file level keyword we can use only taking the field attribute reference .
syntax for that keyword :ref(lib/file/rcdname)

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