Question: 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
How do we determine Reference column to track relationship? Attribute that

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