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1、1本科畢業(yè)論文外文翻譯本科畢業(yè)論文外文翻譯外文文獻(xiàn)原文外文文獻(xiàn)原文GettingGettingtotoKnowKnowRelationalRelationalDatabasesDatabasesMaterialSource:BeginningC#2008Databases，fromNovicetoProfessionalNotesinApressAuth:VidyaVratAgarwalJamesHuddlestonNowthatyou

2、havegottentoknowthetoolsyou’lluseinthisbookwe’llstepbackabittogiveyouabriefintroductiontotheimptantconceptsofthePCdatabasewldbefedivingintotheexamples.WhatIsaDatabaseInverysimpletermsadatabaseisacollectionofstructuredinf

3、mation.Databasesaredesignedspecificallytomanagelargebodiesofinfmationtheystedatainanganizedstructuredmannerthatmakesiteasyfuserstomanageretrievethatdatawhenrequired.Adatabasemanagementsystem(DBMS)isasoftwareprogramthaten

4、ablesuserstocreatemaintaindatabases.ADBMSalsoallowsuserstowritequeriesfanindividualdatabasetoperfmrequiredactionslikeretrievingdatamodifyingdatadeletingdatasofth.DBMSssuppttables(a.k.a.relationsentities)tostedatainrows(a

5、.k.a.recdstuples)columns(a.k.a.fieldsattributes)similartohowdataappearsinaspreadsheetapplication.ArelationaldatabasemanagementsystemRDBMSisatypeofDBMSthatstesinfmationinthefmofrelatedtables.RDBMSisbasedontherelationalmod

6、el.ChoosingBetweenaSpreadsheetaDatabaseIfdatabasesaremuchlikespreadsheetswhydopeoplestillusedatabaseapplicationsAdatabaseisdesignedtoperfmthefollowingactionsinaneasiermeproductivemannerthanaspreadsheetapplicationwouldreq

7、uire:?Retrieveallrecdsthatmatchparticularcriteria.?Updatemodifyacompletesetofrecdsatonetime.3stateafteratransactionfails.?Stagemanagement:RDBMSsprovideamechanismfdatastagemanagement.Theinternalschemadefineshowdatashouldb

8、eparingDesktopServerRDBMSSystemsIntheindustrytodaywemainlywkwithtwotypesofdatabases:desktopdatabasesserverdatabases.Herewe’llgiveyouabrieflookateachofthem.DesktopDatabasesDesktopdatabasesaredesignedtoservealimitednumbero

9、fusersrunondesktopPCstheyofferalessexpensivesolutionwhereveradatabaseisrequired.Chancesareyouhavewkedwithadesktopdatabaseprogram—MicrosoftSQLServerExpressMicrosoftAccessMicrosoftFoxProFileMakerProParadoxLotusrepresentawi

10、derangeofdesktopdatabasesolutions.Desktopdatabasesdifferfromserverdatabasesinthefollowingways:?Lessexpensive:Mostdesktopsolutionsareavailablefjustafewhundreddollars.InfactifyouownalicensedversionofMicrosoftOfficeProfessi

11、onalyou’realreadyalicensedownerofMicrosoftAccesswhichisoneofthemostcommonlywidelyuseddesktopdatabaseprogramsaround.?Userfriendly:DesktopdatabasesarequiteuserfriendlyeasytowkwithastheydonotrequirecomplexSQLqueriestoperfmd

12、atabaseoperations(althoughsomedesktopdatabasesalsosupptSQLsyntaxifyouwouldliketocode).Desktopdatabasesgenerallyofferaneasytousegraphicaluserinterface.ServerDatabasesServerdatabasesarespecificallydesignedtoservemultipleus

13、ersatatimeofferfeaturesthatallowyoutomanagelargeamountsofdataveryefficientlybyservingmultipleuserrequestssimultaneously.WellknownexamplesofserverdatabasesincludeMicrosoftSQLServeracleSybaseDB2.Herearesomeotheracteristics

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