Question: When we translate a 1:N relationship in an ERD to a relational schema, we add the primary key of one-side entity to the many-side entity

When we translate a 1:N relationship in an ERD to a relational schema, we add the primary key of one-side entity to the many-side entity as a foreign key.

a) Why should we do so?

b) What happen if we add the PK of N-side entity to one-side entity?

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