首页
试卷库
试题库
当前位置：
X题卡
>
所有题目
>
题目详情
关系模型与网状、层次模型的最大区别是( )。
查看本题答案
包含此试题的试卷
中级数据库系统工程师《填空》真题及答案
点击查看
你可能感兴趣的试题
网状层次数据模型与关系数据模型的最大区别在于表示和实现实体之间的联系的方法网状层次数据模型是通过指针
网状层次数据模型与关系数据模型的最大区别在于表示和实现实体之间的联系的方法网状层次数据模型是通过指针
网状层次数据模型与关系数据模型的最大区别在于表示和实现实体之间的联系的方法网状层次数据模型是通过指针
网状层次数据模型与关系数据模型的最大区别在于表示和实现实体之间的联系的方法网状层次 数据模型是通过指
网状层次数据模型与关系数据模型的最大区别在于表示和实现实体之间的联系的方法网状层次数据模型是通过指针
关系数据模型与网状数据模型层次数据模型的最大区别在于表示和实现实体之间的联系的方法关系数据模型是使用
关键字
图标
表格
指针
网状层次数据模型与关系数据模型的最大区别在于表示和实现实体之间的联系的方法网状层次数据模型是通过指针
网状层次数据模型与关系数据模型的最大区别在于表示和实现实体之间联系的方法网状层次数据模型是通过指针链
关系模型与层次模型网状模型的最大区别是实体间联系是通过表格的数据而不是______来实现的
网状层次数据模型与关系数据模型的最大区别在于表示和实现实体之间的联系的方法网状层次数据模型是通过指针
网状层次数据模型与关系数据模型的最大区别在于表示和实行实体之间的联系的方法网状层次数据模型是通过指针
数据库管理系统的数据模型有3种
网状模块、链状模型和层次模型
层次模型、环状模和关系模型
层次模型、网状模型和关系模型
层次模型、网状模型和语义模型
网状层次数据模型与关系数据模型的最大区别在于表示和实行实体之间的联系的方法网状层次数据模型是通过指针
网状层次数据模型与关系数据模型的最大区别在于表示和实行实体之间的联系的方法网状层次数据模型是通过指针
网状层次数据模型与关系数据模型的最大区别在于表示和实现实体之间的联系的方法网状层次数据模型是通过指针
热门试题
更多
WebSQLisaSQL-like26languageforextractinginformationfromtheweb.Itscapabilitiesforperformingnavigationofweb27makeitausefultoolforautomatingseveralweb-relatedtasksthatrequirethesystematicprocessingofeitherailthelinksina28allthepagesthatcanbereachedfromagivenURLthrough29thatmatcha’patternoracombinationofboth.WebSQLalsoprovidestransparentaccesstoindexserversthatcanbequeriedviatheCommon30Interface. 26是
Therelationaldatabasemodelrequiresthedatabe110throughprogramsthatdon’trelyonthepositionofthedatainthedatabase.Thisisindirect111totheotherdatabasemodewheretheprogramhastofollowaseriesofpointerstothedataitseeks.Aprogram112arelationaldatabasesimplyasksforthedataitseeks;theDBMSperformsthenecessarysearchesand113theinformation.The114onhowthesearchisdonearespecifictotheDBMSandvaryfromproducttoproduct. 114是
31analysisemphasizesthedrawingofpictorialsystemmodelstodocumentandvalidatebothexistingand/orproposedsystems.Ultimatelythesystemmodelsbecomethe32fordesigningandconstructinganimprovedsystem.33issuchatechnique.Theemphasisinthistechniqueisprocess-centered.Systemsanalystsdrawaseriesofprocessmodelscalled34.35isanothersuchtechniquethatintegratesdataandprocessconcernsintoconstructscalledobjects. 35是
Alocal-areanetworkLANisacommunicationsnetworkthat125avarietyofdevicesandprovidesa126forinformationexchangeamongthosedevices.ThescopeoftheLANissmalltypicallyasinglebuildingoracluster丛ofbuildings.TheLANisusuallyownedbythesameorganizationthatownsthe127devices.TheinternaldatarateofLANisatleastseveralMb/s. ThebasicofLANcommunicationisbroadcasting.Ateachstationthereisatransmitter/receiverthatcommunicatesovera128sharedByotherstations.Atransmissionfromanyonestationis129toandreceivedbyallotherstations. 128是
Alocal-areanetworkLANisacommunicationsnetworkthat125avarietyofdevicesandprovidesa126forinformationexchangeamongthosedevices.ThescopeoftheLANissmalltypicallyasinglebuildingoracluster丛ofbuildings.TheLANisusuallyownedbythesameorganizationthatownsthe127devices.TheinternaldatarateofLANisatleastseveralMb/s. ThebasicofLANcommunicationisbroadcasting.Ateachstationthereisatransmitter/receiverthatcommunicatesovera128sharedByotherstations.Atransmissionfromanyonestationis129toandreceivedbyallotherstations. 126是
Networkmanagershavelong140practicalvoice-over-IPVOIPsolutions.VOIP141easenetworkmanagementanddecreasescostsbyconvergingacompany’stelephonyanddatainfrastructuresintoonenetwork.AndaVOIPsolutionimplementedatacompany’shead-quarterswithfar-reachingbranchofficescan142tremendousamountsof143inlongdistancephonebillsprovidedthatsolutiondeliversPOTS-likevoice144overtheInternet. 143是
31analysisemphasizesthedrawingofpictorialsystemmodelstodocumentandvalidatebothexistingand/orproposedsystems.Ultimatelythesystemmodelsbecomethe32fordesigningandconstructinganimprovedsystem.33issuchatechnique.Theemphasisinthistechniqueisprocess-centered.Systemsanalystsdrawaseriesofprocessmodelscalled34.35isanothersuchtechniquethatintegratesdataandprocessconcernsintoconstructscalledobjects. 33是
Inobject-oriented51objectscanbeviewedasreusablecomponentsandoncetheprogrammerhasdevelopeda52ofthesecomponentshecan53theamountofnewcodingrequired.But52a54isnosimpletaskbecausetheintegrityoftheOriginalsoftwaredesigniscritical.Reusabilitycanbeamixedblessingforusertooasaprogrammerhastobeabletofindtheobjectheneeds.Butif55isyouraimreusabilityisworththerisk. 52是
Atypical160languagecontainsanapplicativesub-languagewhichapproximatesthemathematicalabstractionsof"timeless"functionsappliedto"spaceless"valueswheretheactualoperationsequencesanduseofstoragespaceduringexpressionevaluationareorganizedbehindthe161.Inthissettingvaluesaredatastructuresoflowvolumetypicallyafewcomputerwordsorlesswhichmeansthatanillusionofspacelessnesscanberealizedbyhaving162resultsduringexpressionevaluationstoredatthediscretionofthelanguageimplementationandeffectingparameter163and164operationsthroughvaluecopying. 162是
Networkmanagershavelong140practicalvoice-over-IPVOIPsolutions.VOIP141easenetworkmanagementanddecreasescostsbyconvergingacompany’stelephonyanddatainfrastructuresintoonenetwork.AndaVOIPsolutionimplementedatacompany’shead-quarterswithfar-reachingbranchofficescan142tremendousamountsof143inlongdistancephonebillsprovidedthatsolutiondeliversPOTS-likevoice144overtheInternet. 141是
Object-orientedDBMSintegratedavarietyof81datatypes-suchasbusinessproceduresgraphicspicturesvoiceandannotatedtext. Objectorientationalsomakesa82toapplicationdevelopmentefficiency.Itmakesthedatafunctionsattributesandrelationshipsanintegralpartofthe83.Inthiswayobjectscanbereusedandreplicated. SomeleadingRDBMSvendorssupporttheconceptofintegratingobjectmanagementcapabilitieswiththeircurrentlineofrelationalproducts.Thatcapabilityenableuserstothedevelopmentcyclesinceintegritylogicandbusinessrolesnolongerneedtobeprogrammed84eachapplication. 82是
Atypical160languagecontainsanapplicativesub-languagewhichapproximatesthemathematicalabstractionsof"timeless"functionsappliedto"spaceless"valueswheretheactualoperationsequencesanduseofstoragespaceduringexpressionevaluationareorganizedbehindthe161.Inthissettingvaluesaredatastructuresoflowvolumetypicallyafewcomputerwordsorlesswhichmeansthatanillusionofspacelessnesscanberealizedbyhaving162resultsduringexpressionevaluationstoredatthediscretionofthelanguageimplementationandeffectingparameter163and164operationsthroughvaluecopying. 164是
31analysisemphasizesthedrawingofpictorialsystemmodelstodocumentandvalidatebothexistingand/orproposedsystems.Ultimatelythesystemmodelsbecomethe32fordesigningandconstructinganimprovedsystem.33issuchatechnique.Theemphasisinthistechniqueisprocess-centered.Systemsanalystsdrawaseriesofprocessmodelscalled34.35isanothersuchtechniquethatintegratesdataandprocessconcernsintoconstructscalledobjects. 31是
Inobject-oriented51objectscanbeviewedasreusablecomponentsandoncetheprogrammerhasdevelopeda52ofthesecomponentshecan53theamountofnewcodingrequired.But52a54isnosimpletaskbecausetheintegrityoftheOriginalsoftwaredesigniscritical.Reusabilitycanbeamixedblessingforusertooasaprogrammerhastobeabletofindtheobjectheneeds.Butif55isyouraimreusabilityisworththerisk. 54是
WebSQLisaSQL-like26languageforextractinginformationfromtheweb.Itscapabilitiesforperformingnavigationofweb27makeitausefultoolforautomatingseveralweb-relatedtasksthatrequirethesystematicprocessingofeitherailthelinksina28allthepagesthatcanbereachedfromagivenURLthrough29thatmatcha’patternoracombinationofboth.WebSQLalsoprovidestransparentaccesstoindexserversthatcanbequeriedviatheCommon30Interface. 28是
Therelationaldatabasemodelrequiresthedatabe110throughprogramsthatdon’trelyonthepositionofthedatainthedatabase.Thisisindirect111totheotherdatabasemodewheretheprogramhastofollowaseriesofpointerstothedataitseeks.Aprogram112arelationaldatabasesimplyasksforthedataitseeks;theDBMSperformsthenecessarysearchesand113theinformation.The114onhowthesearchisdonearespecifictotheDBMSandvaryfromproducttoproduct. 112是
Whenmostpeoplerefertomultimediatheygenerallymeanthecombinationoftwoormorecontinuousmediausuallywithsomeuser115.Inpracticethetwomediaarenormallyaudioandvideothisis116plusmoving117. Itshouldbe’obviousbynowthattransmittingmultimediamaterialinuncompressedformiscompletelyoutof118.Theonlyhopeisthatmassivecompressionispossible.Fortunatelyalargebodyofresearchoverthepastfewdecadeshasledtomanycompressiontechniquesandalgorithmsthatmakemultimediatransmission119. 118是
In85softwareonequestionofnear-universalinterestishowrapidlyWindowsNTwhichbeganshippinglastsummerwillbe86inthemarketplaceandforwhatuses.Forthemostpartobserversare87abouttheoperatingsystem’slongtermprospectsbutexpectittoremainon88ratherthandesktopsduring1994sayingthatitwon’tbecomeamainstreamproductuntil89PCstypicallyhave16to24MBofRAMwhichisunlikelytohappennextyear. 87是
In85softwareonequestionofnear-universalinterestishowrapidlyWindowsNTwhichbeganshippinglastsummerwillbe86inthemarketplaceandforwhatuses.Forthemostpartobserversare87abouttheoperatingsystem’slongtermprospectsbutexpectittoremainon88ratherthandesktopsduring1994sayingthatitwon’tbecomeamainstreamproductuntil89PCstypicallyhave16to24MBofRAMwhichisunlikelytohappennextyear. 89是
Whenmostpeoplerefertomultimediatheygenerallymeanthecombinationoftwoormorecontinuousmediausuallywithsomeuser115.Inpracticethetwomediaarenormallyaudioandvideothisis116plusmoving117. Itshouldbe’obviousbynowthattransmittingmultimediamaterialinuncompressedformiscompletelyoutof118.Theonlyhopeisthatmassivecompressionispossible.Fortunatelyalargebodyofresearchoverthepastfewdecadeshasledtomanycompressiontechniquesandalgorithmsthatmakemultimediatransmission119. 116是
WhilemostrecentattentionintheAIfieldhasbeenfocusedonexpertsystemsoftwareAI66hasalsoseendramaticadvances.Activityinthepastyearswascharacterizedbynewlow-costpowerfulLispmachinestheintroductionofAIworkstationsLispcompilersbecomingavailableforallmajorprofessionalandengineeringworkstationsandthepersonalcomputeremergingasa67.toolforexpertsystemdevelopment.Thenextfewyearswillseethistechnologyevolvesfurther. Becausethe68ofanAIcomputerrepresentsasizableinvestmentcompaniesshouldcarefully69alloptionsthatareavailableaswellashaveagoodideaofwhatthenextgenerationofsystemswillofferinorderto70theoptimumsystem.Thispublicationprovidestheinformationnecessarytogainthisunderstanding. 69是
Forusersmicrokerneltechnologypromises90compactandsophisticatedoperatingsystemsthataretypically91acrossarangeofhardwareplatforms.Theseoperatingsystemswillbecustomizabletoletusersrunmultipleoperatingsystemandapplication"personalities"ontopofasinglemicrokernel92. Microkernelbasedsystemscanprovidethisflexibilitybecausethecoreoperatingsystemfunctionsare93fromthelargenumberofutilitiesfeaturesandextensionsthatarelayeredontopofthem.Asaresultupdatingandmaintainingoperatingsystemiseasiersincedevelopersdon’thavetomodifythe94everytimetheymustacidanewfeature. 92是
Programmingisa46thathasvariousengineeringand47aspects.Althoughmostoftheseaspectsareinterrelatedeachofthemcoversanumberof48andgoalswinchareveryspecific.Theprogressbeingmadeinteaching49isreflectedbythefactthatmost50sciencecurriculacontainabroadspectrumofprogrammingcourseseachemphasizingadifferentaspectofprogramming. 47处是
Atypical160languagecontainsanapplicativesub-languagewhichapproximatesthemathematicalabstractionsof"timeless"functionsappliedto"spaceless"valueswheretheactualoperationsequencesanduseofstoragespaceduringexpressionevaluationareorganizedbehindthe161.Inthissettingvaluesaredatastructuresoflowvolumetypicallyafewcomputerwordsorlesswhichmeansthatanillusionofspacelessnesscanberealizedbyhaving162resultsduringexpressionevaluationstoredatthediscretionofthelanguageimplementationandeffectingparameter163and164operationsthroughvaluecopying. 160是
Object-orientedDBMSintegratedavarietyof81datatypes-suchasbusinessproceduresgraphicspicturesvoiceandannotatedtext. Objectorientationalsomakesa82toapplicationdevelopmentefficiency.Itmakesthedatafunctionsattributesandrelationshipsanintegralpartofthe83.Inthiswayobjectscanbereusedandreplicated. SomeleadingRDBMSvendorssupporttheconceptofintegratingobjectmanagementcapabilitieswiththeircurrentlineofrelationalproducts.Thatcapabilityenableuserstothedevelopmentcyclesinceintegritylogicandbusinessrolesnolongerneedtobeprogrammed84eachapplication. 84是
Forusersmicrokerneltechnologypromises90compactandsophisticatedoperatingsystemsthataretypically91acrossarangeofhardwareplatforms.Theseoperatingsystemswillbecustomizabletoletusersrunmultipleoperatingsystemandapplication"personalities"ontopofasinglemicrokernel92. Microkernelbasedsystemscanprovidethisflexibilitybecausethecoreoperatingsystemfunctionsare93fromthelargenumberofutilitiesfeaturesandextensionsthatarelayeredontopofthem.Asaresultupdatingandmaintainingoperatingsystemiseasiersincedevelopersdon’thavetomodifythe94everytimetheymustacidanewfeature. 90是
WhilemostrecentattentionintheAIfieldhasbeenfocusedonexpertsystemsoftwareAI66hasalsoseendramaticadvances.Activityinthepastyearswascharacterizedbynewlow-costpowerfulLispmachinestheintroductionofAIworkstationsLispcompilersbecomingavailableforallmajorprofessionalandengineeringworkstationsandthepersonalcomputeremergingasa67.toolforexpertsystemdevelopment.Thenextfewyearswillseethistechnologyevolvesfurther. Becausethe68ofanAIcomputerrepresentsasizableinvestmentcompaniesshouldcarefully69alloptionsthatareavailableaswellashaveagoodideaofwhatthenextgenerationofsystemswillofferinorderto70theoptimumsystem.Thispublicationprovidestheinformationnecessarytogainthisunderstanding. 67是
Forusersmicrokerneltechnologypromises90compactandsophisticatedoperatingsystemsthataretypically91acrossarangeofhardwareplatforms.Theseoperatingsystemswillbecustomizabletoletusersrunmultipleoperatingsystemandapplication"personalities"ontopofasinglemicrokernel92. Microkernelbasedsystemscanprovidethisflexibilitybecausethecoreoperatingsystemfunctionsare93fromthelargenumberofutilitiesfeaturesandextensionsthatarelayeredontopofthem.Asaresultupdatingandmaintainingoperatingsystemiseasiersincedevelopersdon’thavetomodifythe94everytimetheymustacidanewfeature. 94是
Therelationaldatabasemodelrequiresthedatabe110throughprogramsthatdon’trelyonthepositionofthedatainthedatabase.Thisisindirect111totheotherdatabasemodewheretheprogramhastofollowaseriesofpointerstothedataitseeks.Aprogram112arelationaldatabasesimplyasksforthedataitseeks;theDBMSperformsthenecessarysearchesand113theinformation.The114onhowthesearchisdonearespecifictotheDBMSandvaryfromproducttoproduct. 110是
WebSQLisaSQL-like26languageforextractinginformationfromtheweb.Itscapabilitiesforperformingnavigationofweb27makeitausefultoolforautomatingseveralweb-relatedtasksthatrequirethesystematicprocessingofeitherailthelinksina28allthepagesthatcanbereachedfromagivenURLthrough29thatmatcha’patternoracombinationofboth.WebSQLalsoprovidestransparentaccesstoindexserversthatcanbequeriedviatheCommon30Interface. 30是
热门题库
更多
初级网络管理员
初级信息处理技术员
中级数据库系统工程师
中级多媒体应用设计师
高级系统分析师
高级网络规划设计师
高级系统架构师
中级信息系统监理师
初级通信工程师
中级通信工程师
通信新技术、新业务知识
无线通信专业技术
移动通信专业技术
有线传输专业技术
电话交换专业技术
电信网络专业技术
湘公网安备 43130202000226号