计算机四级

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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相似问题和答案

第1题:

Youneedtoallowtheusertotogglebetweenautomaticqueryandnoautomaticqueryusingapop-upmenu.Whichbuilt-inwouldyouuseinthemenuitemcommandtoobtaintherelationshipname?()

A.GET_RELATION_PROPERTY

B.SET_RELATION_PROPERTY

C.GET_BLOCK_PROPERTY

D.GET_FORM_PROPERTY


参考答案:C

第2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3题:

()that happen,what()we do?

A、If…shall

B、Suppose…shall

C、Should…would

D、Had…should


参考答案:C

第4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:

Whichofthefollowingflowcontrolsettingsallowsresumptionofsuspendedoutputbyhittingthe"R"key?()

A.XON/XOFF

B.NONE

C.RTS/CTS

D.XON/IXANY


参考答案:D

第7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8题:

Which DBMS_SCHEDULER procedure(s) can be used to alter an existing job? ()

A. SET_ATTRIBUTE_NULL

B. ALTER_JOB

C. ALTER_JOB_PARAMETERS

D. ALTER

E. SET_ATTRIBUTE


参考答案:A, E

第9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10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