what is the difference between adding keys & constraints
into a phisical file
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Answer Posted / jherie
A key field defines the order in which the records of a PF
member will be sorted (ascending or descending).
On the other hand, constraints, such as UNIQUE, defines
which key field values or records are valid/allowable to be
written into a file. UNIQUE prevents a record with
duplicate key field values to be written into a PF.
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