Should I use a foreign key or string value from foreign table?

I'm not sure that I understand why there's a conflict. You are aware that keys, both primary and foreign, can as easily be string types as number types? You can have the advantages of both systems by making the job type field the primary key in the job types table and the foreign key in the employee table.

It also sounds like it might be overly complicating things for a small reward. I'd say the best practice is to stick with a foreign key for simplicity's sake.

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