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How do we determine Reference column to track relationship? Attribute that easily helps uniquely identify related record in both parent and child Attribute that easily

How do we determine Reference column to track relationship?

Attribute that easily helps uniquely identify related record in both parent and child

Attribute that easily helps uniquely identify related record in child

Attribute that easily helps uniquely identify related record in parent

Attribute that is smallest in size to reduce extra column space required in the database

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