Definition
Dataredundancywillhindertheintegrityofthedatainthedatabase,andwillalsocauseawasteofstoragespace.Toreducedataredundancyasmuchaspossibleisoneofthemaingoalsofdatabasedesign.Oneofthemainideasofthenormalizationtheoryofrelationalmodel(hereinafterreferredtoasNFtheory)istheprincipleofleastredundancy,thatis,thestandardizedrelationalmodelshouldhavetheleastredundancyinacertainsense.However,NFtheoryhasnostandardconceptavailable.Accordingtotheprincipleofequivalence,theremaybeseveralredundantdefinitionsunderdifferentpremisessuchasuniversalrelationassumptionornot.
Englishcomparison
redundancyof;redundancy;redundant;redundancydegree;
explanation
1,referstoaspecialemotionininterpersonalcommunicationThewayofexpressionistoconveysincereaffectionwithseeminglyredundantandirrelevantnonsense,andcausetheinteractionandreturnofemotions.Whenrelativesandfriendsmeetindailylife,knowingthattheyhaveeaten,theystillkindlyask:"Haveyoueaten?"Whentheirchildrengoout,parentswillrepeatedlywarn:"Becarefulwhencrossingthestreet."Thesebehaviorsaremanifestationsofredundancy.Duetothenarrowingofthescopeofactivitiesandtheincreaseofpsychologicalloneliness,theelderlyespeciallyhopethatacaringpersonwillnagwiththem,its...