In the preceding lesson, you learned that many-to-many relationships are resolved by breaking down each M:N relationship into two 1:N relationships. This is achieved by creating a composite entity whose only function is to represent the link between the other two entities. You also learned that the composite entity has no key attribute of its own; rather, it accepts the key attributes from the other two entities to form a composite key attribute.

The Stories on CD case study has one many-to-many relationship: the ORDER:CD relationship. Your task is to resolve the ORDER:CD relationship. The two entities are illustrated below, complete with the attributes you will need to complete this exercise.

When a composite entity is created to link two other entities, it sometimes makes sense to move some non-key attributes out of the other two entities and into the composite entity. Keep this in mind when you populate the composite entity with attributes.

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