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●For relation where primary key contains multiple attributes,no non－key attribute should b

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●For relation where primary key contains multiple attributes，no non-key attribute should be functionally dependent on a part of primary key．This relation R is at least in (66) .

(66) A．3NF

B．2NF

C．INF

D．BCNF

参考答案:

A【解析】译文：对于主键包含多个属性的关系，没有非主属性函数依赖于部分主键。这样的关系R至少是3NF。

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