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Duplicate info in tables Best Practice

Duplicate info in tables Best Practice
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I am debating on adding another field to a table in order to track dates. I have the information in another table but these 2 tables have no relationship to each other.

Initially, I was thinking of creating a relationship between the two tables in order to pull the date from there. But this table will not always be filled out depending on the employee class.

So, I was thinking of just adding the field rather than creating a relationship as I don't always need the info in that table.

I am wondering before I go and add the extra work, would this be the most efficient way of doing this?
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