Explaining emp table does not have assigned primary key

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Reference no: EM1350418

Developers have noticed that the EMP table does not have an assigned primary key. The EMP_ID column has been selected to be the primary key. The table already has data in the table. When trying to assign the primary key, the operation fails. What are the probable causes for the inability to make the EMP_ID the primary key?

Reference no: EM1350418

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