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I would agree that every table should have a unique key. Isn't the question if that key should be defined by keying the physical file? There I would say no. Create a logical file over the physical that has the unique key definition. Makes future maintenance easier when the primary key changes for the table or you might need to do something to the table that would violate the unique key temporarily. In that case you just delete the logical file, do what you need to do and recreate the logical.
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