Association: A transaction is related to another transaction, a student has a relationship with his university,
Aggregation: It is a special association that emphasizes the overall and part of the relationship, engine, tires, chassis, and the like to polymitar into a car. When this car is disassembled (destructive), the engine and tires can continue to be used.
Combination: stronger form of aggregation, emphasizing parts and overall have the same life cycle, the whole is responsible for creation, management, and maintenance. There are two hands, and the hand and man is a combination. When people die, both hands do not exist (exclude organ donation ~)
In Rose, how to combine relationships?
The combination is also aggregation. If you want a solid diamond icon, you can use the following methods: 1) Double-click the link to the AGGREGATION, open Specification2) Select Role B Detail, select, by value. This way you set the aggregation is a combination, not aggregated.
