Question

What is Multiplicity Rule #1?

1) Whenever there are mandatory-minimums on both sides of a one-to-one relationship, or an optional-minimum on one side of a one-to-one relationship, the two entities should be combined into a single entity
2) Whenever there are optional-minimums on both sides of a one-to-one relationship, create an association table linking the two entities
3) Whenever there is a one-to-many relationship (regardless of the minimum constraints), place the primary key of the 'one' entity into the 'many' entity as a foreign key
4) Whenever there is a many-to-many relationship, (regardless of the minimum constraints), create an association table linking the two entities

Answer 1

The Multiplicity Rule #1 in database design states that in a one-to-many relationship, the primary key of the 'one' entity should be placed into the 'many' entity as a foreign key.

Step-by-step explanation:

The Multiplicity Rule #1 is a guideline used in database design to determine how two entities should be combined or linked based on their relationship type and minimum constraints. The rule states that whenever there is a one-to-many relationship, the primary key of the 'one' entity should be placed into the 'many' entity as a foreign key. This allows the 'many' entity to be associated with the 'one' entity by referencing its primary key.