The one-to-many (1:M) relationship is easily implemented in the relational model by putting the foreign key of the "1" side in the table of the "many" side as a primary key.

Question

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The foreign key of the "M" side is put in the table of the "many" side, not as a primary key, but as a reference to the primary key of the "1" side. This allows for multiple records on the "M" side to be associated with a single record on the "1" side.

The One-To-Many (1:M) Relationship Is Easily Implemented in the Relational