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【单选题】
E-R模型到关系模型的转化,若实体间的联系是多对多联系,( )A.
任意一个关系模式中增加另一关系模式的关键属性和联系的属性即可
B.
为联系类型单独建立一个关系模式,其属性为两方实体类型的关键属性加上联系的属性
C.
不需要 增加另一关系模式的关键属性和联系的属性
D.
为联系类型单独建立一个关系模式,其属性不包括参加两方实体类型的关键属性
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