關(guān)系型數(shù)據(jù)庫(kù)的模糊查詢(xún)方法研究與實(shí)現(xiàn).pdf

1、南京信息工程大學(xué)碩士學(xué)位論文關(guān)系型數(shù)據(jù)庫(kù)的模糊查詢(xún)方法研究與實(shí)現(xiàn)姓名：王慧申請(qǐng)學(xué)位級(jí)別：碩士專(zhuān)業(yè)：系統(tǒng)分析與集成指導(dǎo)教師：張穎超20090501南京信息工程大學(xué)碩士學(xué)位論文AbstractSincefuzzysetstheoryisbeenproposedbyZadehin1965，theconceptoffuzziness&uncertaintyhasbeenintroducedtofieldofdatabasetoextendthe

2、oryofdatabasesystemTherearemainlytworesearchbranchesoffuzzyextensionsaboutrelationaldatabase：oneiSresearchonfuzzydatabase，andtheotherisfuzzyextensionofstandardquerylanguage—SQLItseemsthmtheapplicationoftheoryoffuzzydatab

3、asereliesontheupgradingofoveraUdatabasewhichisofliRiechancetObecometruerecentlyandthemainstreamofdatabasesiSrelationaldatabases；thereforeitismorerealisticandmorepracticaltodosomeresearchonfuzzyquerydirectlyOilthegroundof

4、currentdatabasesystemFuzzyextensionoftheoreticalsystemofSQLqueryisbeenstudiedhereClassicalDBMSCalljustdealwithcrispquerieswhicha陀onthegroundoftwovaluedlogic，、№ilelotsofnaturaldescriptionsarealwaysbeenusedinritualquery，wh

5、ichmeansthatfuzzyquerieswithnaRlrallanguageismoreefficientmorevaluedandmorepracticalBasedonfuzzysetsandpreviousstudiesinthisfield，theoreticalsystemoffuzzySQLqueryisbeenextentedandimprovedthroughourstudyHere，cardinalityof

6、fuzzysetsinfuzzyqueryiSfirstlybeendiscussed，thenAggregationqueryandSQLquerywithfuzzylinguisticquantifies，especiallywhentheyunderconditionswithweights，arealsobeenanalyzedTakingconsiderationofindividualviews，Technologyoffu

7、zzyCmeansclusteringforselflearningisintroducedtOjustifyanddeterminethegivenmembershipfunctionsordirectlygainthemembershipdegreeasthebasisoffuzzyquerywhichresolvestheproblemcausedbyobjectivityofthegivenmembershipfunctions

8、Inthemeantime，studyoflinguisticweights，linguisticthresholdandlinguisticmatchingdegreeisbeensummarizedanddiscussedAlltheaboveresearchachievementswillenrichandimprovethetheoreticalsystemoffuzzyquerytogreatextentPluginoffuz

9、zyqueryisdesignedandpartlyimplementedhereonthebaseofCOMtechnology。111ispluginisindependentofbothprogramminglanguagesandtablesofdatabase，andcallbedynamicallyloadedbyopenplatform111isPlugincontainsmodulessuchasmembershipfu

10、nctionliabrary，fuzzyoperatorliabrary，F(xiàn)CMliabrary，andfuzzyquerylibrarycrispqueryandSOonBothcrispqueryandfuzzyquerywithnaturallanguagesCanbecopedwithflexiblyinthissystemwhichimprovesthepracticality，flexibilityandconvenienc