multivalued attributes in databases

Question

How should a relational database be designed to handle multi-valued attributes ?

edit: To elaborate:

There are two ways I could think of for do

Answer 1

There are two possible approaches for this -

1. Relationship : Storing multiple values for one attribute of an entity is done through referenced key-foreign key relationships. For more info, check this.
2. Set : A scalar datatype in mysql that can have zero or more values, each of which must be chosen from a list of permitted values specified when the table is created. For more info, please check this and this link.