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

9 查阅

●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。

软考初级

You wish to segment your LAN into multiple broadcast domains. Whic

By means of multiple pipeline to carry out multiple processing,thi

The technology for carrying out multiple processing by means of mu

For relation R where primary key contains multiple, no non－key attr

For relation R where primary key contains multiple attributes,no n

Typical MISD (multiple－instruction single－data stream) computing mod

下列( )说法是不正确的。A)SYBASE IQ产品支持Bit－wise索引技术 B)SYBASE

随便看看:

Ta老师题库

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

相关问题:

随便看看:

Ta老师题库

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

相关问题:

随便看看:

Ta老师-周边问题