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在关系数据库中，表对应于三级模式结构中的（）。
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在关系数据库中表是三级模式结构中的外模式
12.SQL语言支持数据库三级模式结构在SQL中外模式对应于视图和部分基本表模式对应于基本表全体内模
SQL语言支持数据库三级模式结构在SQL中外模式对应于视图和部分基本表模式对应于基本表全体内模式对应
SQL语言支持数据库三级模式结构在SQL中模式对应于
在SQL中基本表对应于数据库三级模式结构的______
模式
内模式
外模式
存储文件
SQL语言支持数据库三级模式结构在SQL中外模式对应于视图和部分基本表模式对应于基本表全体内模式对应
SQL语言支持数据库三级模式结构在SQL中外模式对应于视图和部分基本表模式对应于基本表全体内模式对应
SQL语言支持数据库三级模式结构在SQL中模式对应于A基本表B存储文件C行D列
视图的数据来自一个或多个基本表数据库中只存储视图的定义并不存储视图所包含的数据根据视图的概念和用途关
外模式
模式
内模式
存储模式
关系数据库中的视图对应数据库系统的三级模式结构中的模式
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Inlookingattheclassstructureofanentiresystemwemayfindthatitsinheritance1iseitherwideandshallownarrowanddeeporbalanced.Classstructuresthatarewideandshallowusuallyrepresentforestsof2classesthatcanbemixedandmatched.Classstructuresthatarenarrowanddeeprepresenttreesofclassesthatarerelatedbyacommonancestor.Thereareadvantagesanddisadvantagestoeachapproach.Forestsofclassesaremoreloosely3buttheymaynotexploitallthecommonalitythatexists.Treesofclassesexploitthiscommonalitysothatindividualclassesaresmallerthaninforests.Howevertounderstandaparticularclassitisusuallynecessarytounderstandthemeaningofalltheclassesitinheritsfromoruses.Thepropershapeofaclassstructureishighlyproblem-dependent.Wemustmakesimilartrade-offsamonginheritanceaggregationandusingrelation-ships.ForexampleshouldtheclassCarinheritcontainorusetheclassesnamedEngineandWheelInthiscasewesuggestthatan4relationshipismoreappropriatethaninheritancerelationship.MeyerstatesthatbetweentheclassAandB5isappropriateifeveryinstanceofBmayalsobeviewedasaninstanceofA.TheclientrelationshipisappropriatewheneveryinstanceofBsimplypossessesoneormoreattributesofA.Fromanotherperspectiveifthebehaviorofanobjectismorethanthesumofitsindividualpartsthencreatinganaggregationrelationshipratherthananinheritancerelationshipbetweentheappropriateclassesisprobablysuperior.4
著作权法中计算机软件著作权保护的对象是_____
Generallydataminingsometimescalleddataorknowledgediscoveryistheprocessofanalyzingdatafromdifferentperspectivesand1itintousefulinformationinformationthatcanbeusedtoincreaserevenue2costsorboth.Dataminingsoftwareisoneofanumberofanalyticaltoolsforanalyzingdata.It3userstoanalyzedatafrommanydifferentdimensionsoranglescategorizeitandsummarizetherelationshipsidentified.Technicallydataminingistheprocessoffindingcorrelationsorpatternsamongdozensoffieldsinlargerelationaldatabases.Althoughdataminingisa4newtermthetechnologyisnot.Companieshaveusedpowerfulcomputerstosiftthroughvolumesofsupermarketscannerdataandanalyzemarketresearchreportsforyears.Howevercontinuousinnovationsincomputerprocessingpowerdiskstorageandstatisticalsoftwarearedramaticallyincreasingtheaccuracyofanalysiswhiledriving5thecost.1
Generallydataminingsometimescalleddataorknowledgediscoveryistheprocessofanalyzingdatafromdifferentperspectivesand1itintousefulinformationinformationthatcanbeusedtoincreaserevenue2costsorboth.Dataminingsoftwareisoneofanumberofanalyticaltoolsforanalyzingdata.It3userstoanalyzedatafrommanydifferentdimensionsoranglescategorizeitandsummarizetherelationshipsidentified.Technicallydataminingistheprocessoffindingcorrelationsorpatternsamongdozensoffieldsinlargerelationaldatabases.Althoughdataminingisa4newtermthetechnologyisnot.Companieshaveusedpowerfulcomputerstosiftthroughvolumesofsupermarketscannerdataandanalyzemarketresearchreportsforyears.Howevercontinuousinnovationsincomputerprocessingpowerdiskstorageandstatisticalsoftwarearedramaticallyincreasingtheaccuracyofanalysiswhiledriving5thecost.3
以下关于数据库镜像叙述不正确的是
小张在M公司担任程序员他执行本公司工作任务独立完成了某应用程序的开发和设计那么该应用程序的软件著作权应当归属______享有
以下关于VisualBasic6.0的说法中错误的是
声音的三要素为音调音强和音色其中音色是由混入基音的1决定的若对声音以22.05kHz的采样频率8位采样深度进行采样则10分钟双声道立体声的存储量为2字节2
DOMisaplatform-andlanguage-1APIthatallowsprogramsandscriptstodynamicallyaccessandupdatethecontentstructureandstyleofWWWdocumentscurrentlydefinitionsforHTMLandXMLdocumentsarepartofthespecification.Thedocumentcanbefurtherprocessedandtheresultsofthatprocessingcanbeincorporatedbackintothepresented2DOMisa3-basedAPItodocumentswhichrequiresthewholedocumenttoberepresentedin4whileprocessingit.AsimpleralternativetoDOMistheevent-basedSAXwhichcanbeusedtoprocessverylarge5documentsthatdonotfitintothememoryavailableforprocessing.1
IS09000:2000标准是_____系列标准
已经发布实施的标准包括已确认或修改补充的标准经过实施一定时期后对其内容再次审查以确保其有效性先进性和适用性其周期一般不超过______年
甲将其一篇短文心灵的呼唤投递给杂志社未经甲的许可杂志社便委托乙对甲的短文进行修改然后杂志社将署名为乙和甲的短文发表在其刊物上则______
多媒体应用需要对庞大的数据进行压缩常见的压缩编码方法可分为两大类一类是无损压缩法另一类是有损压缩法也称12属于无损压缩法2
人耳能听得到的音频信号的频率范围是20Hz～20kHz包括语音音乐和其它声音其中语音频率范围通常为______
VirtualizationisanapproachtoITthatpoolsandshares1sothatutilizationisoptimizedandsuppliesautomaticallymeetdemand.TraditionalITenvironmentsareoftensiloswherebothtechnologyandhuman2arealignedaroundanapplicationorbusinessfunction.Withavirtualized3peopleprocesses7andtechnologyarefocusedonmeetingservicelevels4isallocateddynamicallyresourcesareoptimizedandtheentireinfrastructureissimplifiedandflexible.Weofferabroadspectrumofvirtualization5thatallowscustomerstochoosethemostappropriatepathandoptimizationfocusfortheirITinfrastructureresources.2
Inlookingattheclassstructureofanentiresystemwemayfindthatitsinheritance1iseitherwideandshallownarrowanddeeporbalanced.Classstructuresthatarewideandshallowusuallyrepresentforestsof2classesthatcanbemixedandmatched.Classstructuresthatarenarrowanddeeprepresenttreesofclassesthatarerelatedbyacommonancestor.Thereareadvantagesanddisadvantagestoeachapproach.Forestsofclassesaremoreloosely3buttheymaynotexploitallthecommonalitythatexists.Treesofclassesexploitthiscommonalitysothatindividualclassesaresmallerthaninforests.Howevertounderstandaparticularclassitisusuallynecessarytounderstandthemeaningofalltheclassesitinheritsfromoruses.Thepropershapeofaclassstructureishighlyproblem-dependent.Wemustmakesimilartrade-offsamonginheritanceaggregationandusingrelation-ships.ForexampleshouldtheclassCarinheritcontainorusetheclassesnamedEngineandWheelInthiscasewesuggestthatan4relationshipismoreappropriatethaninheritancerelationship.MeyerstatesthatbetweentheclassAandB5isappropriateifeveryinstanceofBmayalsobeviewedasaninstanceofA.TheclientrelationshipisappropriatewheneveryinstanceofBsimplypossessesoneormoreattributesofA.Fromanotherperspectiveifthebehaviorofanobjectismorethanthesumofitsindividualpartsthencreatinganaggregationrelationshipratherthananinheritancerelationshipbetweentheappropriateclassesisprobablysuperior.2
DOMisaplatform-andlanguage-1APIthatallowsprogramsandscriptstodynamicallyaccessandupdatethecontentstructureandstyleofWWWdocumentscurrentlydefinitionsforHTMLandXMLdocumentsarepartofthespecification.Thedocumentcanbefurtherprocessedandtheresultsofthatprocessingcanbeincorporatedbackintothepresented2DOMisa3-basedAPItodocumentswhichrequiresthewholedocumenttoberepresentedin4whileprocessingit.AsimpleralternativetoDOMistheevent-basedSAXwhichcanbeusedtoprocessverylarge5documentsthatdonotfitintothememoryavailableforprocessing.3
NAC’sNetworkAccessControlroleistorestrictnetworkaccesstoonlycompliantendpointsand1users.HoweverNACisnotacompleteLAN2solution;additionalproactiveand3securitymeasuresmustbeimplemented.NevisisthefirstandonlycomprehensiveLANsecuritysolutionthatcombinesdeepsecurityprocessingofeverypacketat100Gbpsensuringahighlevelofsecurityplusapplicationavailabilityandperformance.NevisintegratesNACasthefirstlineofLANsecurity4InadditiontoNACenterprisesneedtoimplementrole--basednetworkaccesscontrolaswellascriticalproactivesecuritymeasures-real-timemultilevel5inspectionandmicrosecondthreatcontainment.4
下列关于关系模型的叙述中错误的是
Generallydataminingsometimescalleddataorknowledgediscoveryistheprocessofanalyzingdatafromdifferentperspectivesand1itintousefulinformationinformationthatcanbeusedtoincreaserevenue2costsorboth.Dataminingsoftwareisoneofanumberofanalyticaltoolsforanalyzingdata.It3userstoanalyzedatafrommanydifferentdimensionsoranglescategorizeitandsummarizetherelationshipsidentified.Technicallydataminingistheprocessoffindingcorrelationsorpatternsamongdozensoffieldsinlargerelationaldatabases.Althoughdataminingisa4newtermthetechnologyisnot.Companieshaveusedpowerfulcomputerstosiftthroughvolumesofsupermarketscannerdataandanalyzemarketresearchreportsforyears.Howevercontinuousinnovationsincomputerprocessingpowerdiskstorageandstatisticalsoftwarearedramaticallyincreasingtheaccuracyofanalysiswhiledriving5thecost.5
超文本是一种信息管理技术其组织形式以______作为基本单位
静态图像压缩标准JPEG2000中使用的是______算法
关于数据仓库设计下列说法正确是
软件著作权受法律保护的期限是______一旦保护期限届满权利自行终止成为社会公众可以自由使用的知识
VirtualizationisanapproachtoITthatpoolsandshares1sothatutilizationisoptimizedandsuppliesautomaticallymeetdemand.TraditionalITenvironmentsareoftensiloswherebothtechnologyandhuman2arealignedaroundanapplicationorbusinessfunction.Withavirtualized3peopleprocesses7andtechnologyarefocusedonmeetingservicelevels4isallocateddynamicallyresourcesareoptimizedandtheentireinfrastructureissimplifiedandflexible.Weofferabroadspectrumofvirtualization5thatallowscustomerstochoosethemostappropriatepathandoptimizationfocusfortheirITinfrastructureresources.4
下列关于著作权与专利权的描述正确的是______
PC机处理人耳能听得到的音频信号其频率范围是______
我国著作权法中______系指同一概念
若每个像素具有8位的颜色深度则可表示1种不同的颜色若某个图像具有640×480像素点其未压缩的原始数据需占用2字节的存储空间2
DOMisaplatform-andlanguage-1APIthatallowsprogramsandscriptstodynamicallyaccessandupdatethecontentstructureandstyleofWWWdocumentscurrentlydefinitionsforHTMLandXMLdocumentsarepartofthespecification.Thedocumentcanbefurtherprocessedandtheresultsofthatprocessingcanbeincorporatedbackintothepresented2DOMisa3-basedAPItodocumentswhichrequiresthewholedocumenttoberepresentedin4whileprocessingit.AsimpleralternativetoDOMistheevent-basedSAXwhichcanbeusedtoprocessverylarge5documentsthatdonotfitintothememoryavailableforprocessing.5
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