For relation R where primary key contains multiple, no non-key attribute should be functionally dependent on a part of the primary key.This relation R is at least inA.1NFB.2NFC.3NFD.BCNF

题目

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

A.1NF

B.2NF

C.3NF

D.BCNF


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参考答案和解析
正确答案:B
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  • 第1题:

    WhichXSLifstatementchecksfortheexistenceofahomepageattributewithinanSTSUniversalUserXMLstructure?()

    A.<xsl:iftest="//stsuuser:AttributeList/stsuuser:Attribute[attr=‘homepage‘]">

    B.<xsl:iftest="//stsuuser:AttributeList/stsuuser:Attribute[@name=‘homepage‘]">

    C.<xsl:if-exists="//stsuuser:AttributeList/stsuuser:Attribute/custom:Homepage">

    D.<xsl:if-exists="//stsuuser:AttributeList/stsuuser:Attribute[@name=‘homepage‘])>


    参考答案:B

  • 第2题:

    设置 d3 力导向图文本时,不可以使用以下哪种方式?

    A.xx.text((d)=>{return d.relation});

    B.xx.text("hello")

    C.xx.text(d.relation);

    D.xx.text(function(d)=>{return d.relation});


    差分GPS三维定位

  • 第3题:

    下面那一项不属于CSS3中新增加的属性选择器?

    A.[attribute^=value]

    B.[attribute$=value]

    C.[attribute~=value]

    D.[attribute*=value]


    C

  • 第4题:

    下列哪个选项可以选择属性的值以value开始的元素?

    A.[attribute^=value]

    B.[attribute$=value]

    C.:attribute^=value

    D.:attribute$=value


    [attribute^=value]

  • 第5题:

    保证实体完整性的措施: 、unique约束或identity列。

    A.primary 约束

    B.primary key约束

    C.key约束

    D.参照完整性


    主码

  • 第6题:

    3、4R策略是指与顾客建立关联(Relevance),反应(React),关系(Relation),回报(Return)。由美国的丹纳.史哈什(Done Schuhz)提出,4R策略阐述了一个全新营销模式。


    正确