Definicja aggregating relationship type

Co znaczy AGGREGATING RELATIONSHIP TYPE:

A connection between two entity types.

Two entity types have an aggregating relationship when:

The existence of the target entity type depends on the source entity type, that is, the lifespan of an instance of the target entity type is less than or equal to the lifespan of the instance of the source entity type. The target entity type is created by the source entity type, that is, the source entity type can influence the attributes directly. At least one other source entity type is involved in the creation of the target entity type.