●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.3NFB.2NFC.INFD.BCNF

题目

●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


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更多“●For relation where primary key contains multiple attributes,no non-key attribute should b ”相关问题
  • 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:

    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3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4题:

    利用XSL创建一style属性,style的值为“color:bule;background-color:red”,能实现该功能的选项为()。

    A.<attribute name="color">blue</attribute> <attribute name="background-color">red</attribute>

    B.<attribute name="style">color:blue</attribute> <attribute name="style">background-color:red</attribute>

    C.<attribute name="style"> color:blue;background-color:red </attribute>

    D.<element attribute="style"> color:blue;background-color:red </element>


    color:blue;background-color:red

  • 第5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6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