Question

关于ER模型转换成关系模型。

在ER模型中，如果有6个不同实体集，有9个不同的二元联系，其中3个1∶N联系，3个1∶1联系，3个M∶N联系，根据ER模型转换成关系模型的规则，转换成关系的数目是( )
A.6 B.9 C.12 D.15

请说明具体步骤或者理由

Answer 1

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