Question: In a database, there is a table that keeps the qualification of the employees. The attributes contained are year obtained and certificate and title .

In a database, there is a table that keeps the qualification of the employees. The attributes contained are year obtained and certificate and title. The foreign key in this table is the employee's ID. Which attribute should be the primary key of the table or should I add a surrogate key by myself like qualification code? Is there any transitive dependency in this table?

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