Normalization yog txheej txheem los teeb tsa cov ntaub ntawv hauv cov ntaub ntawv. Nws yog ib qho tseem ceeb uas database yog ib txwm ua kom txo qis qis dua (cov ntaub ntawv theej tawm) thiab kom ntseeg tau tias tsuas yog cov ntaub ntawv muaj feem raug muab khaws cia rau hauv txhua lub roojNws kuj tiv thaiv txhua yam teeb meem tshwm sim los ntawm kev hloov kho cov ntaub ntawv xws li ntxig, tshem tawm., thiab hloov tshiab.
Vim li cas normalization siv hauv DBMS?
Normalization yog txheej txheem los teeb tsa cov ntaub ntawv hauv cov ntaub ntawv. Nws yog ib qho tseem ceeb uas lub database yog normalized kom txo qis redundancy (cov ntaub ntawv duplicate) thiab kom ntseeg tau tias tsuas yog cov ntaub ntawv ntsig txog khaws cia rau hauv txhua lub roojNws kuj tiv thaiv txhua yam teeb meem tshwm sim los ntawm kev hloov kho cov ntaub ntawv xws li kev ntxig, tshem tawm., thiab hloov tshiab.
Vim li cas thiaj li yuav tsum tau normalization?
Lub hom phiaj ntawm normalization yog hloov cov txiaj ntsig ntawm kab zauv hauv cov ntaub ntawv mus rau qhov ntsuas ntau, tsis muaj qhov sib txawv ntawm qhov sib txawv ntawm qhov muaj nuj nqis. Rau kev kawm tshuab, txhua dataset tsis xav tau normalization. Nws yuav tsum tau tsuas yog thaum nta muaj ntau yam sib txawv.
Vim li cas normalization yuav tsum tau nyob hauv SQL?
Ib qho ntawm cov tsav tsheb tom qab cov ntaub ntawv normalization yog txhawm rau txhim kho cov ntaub ntawv los ntawm kev txo qis cov ntaub ntawv rov qab. Kev rov ua dua ntawm cov ntaub ntawv txhais tau hais tias muaj ntau daim ntawv theej ntawm tib cov ntaub ntawv nthuav tawm ntau qhov chaw hauv tib lub database.
Cov kev cai normalization yog dab tsi?
cov cai tswj kev cai yog siv los hloov lossis hloov kho cov ntaub ntawv hauv phau ntawv metadata ntawm ntau theem, piv txwv li thaum cov ntaub ntawv khaws cia hauv Metadata Editor, raug xa tawm los ntawm kev xa tawm profile, imported los ntawm kev tshawb nrhiav sab nraud cov peev txheej, lossis kho los ntawm "Txhim kho cov ntaub ntawv" ntawv qhia zaub mov hauv Metadata Editor.
