Video: Ib qho chaw tsis muaj zog puas tuaj yeem muaj qhov chaw tsis muaj zog?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Qhov chaw tsis muaj zog hom muaj yuam sij ib nrab. Nco tseg– Qhov chaw tsis muaj zog ib txwm muaj tag nrho kev koom tes tab sis muaj zog qhov chaw yuav tsis muaj tag nrho kev koom tes. Qhov chaw tsis muaj zog yog nyob ntawm muaj zog qhov chaw kom ntseeg tau tias muaj nyob ntawm tsis muaj zog qhov chaw . Zoo li muaj zog qhov chaw , tsis muaj zog ua tsis yog muaj ib qho tseem ceeb, Nws muaj tus yuam sij kev ntxub ntxaug ib nrab.
Ntxiv rau qhov no, dab tsi yog qhov chaw tsis muaj zog?
Nyob rau hauv kev sib raug zoo database, a tsis muaj zog qhov chaw yog ib qhov chaw uas tsis tuaj yeem raug txheeb xyuas los ntawm nws cov attributesalone; yog li ntawd, nws yuav tsum siv tus yuam sij txawv teb chaws ua ke nrog nws cov cwj pwm los tsim tus yuam sij tseem ceeb. Tus yuam sij txawv teb chaws feem ntau yog qhov tseem ceeb ntawm tus yuam sij qhov chaw nws muaj feem rau.
Ib yam li ntawd, qhov chaw tsis muaj zog puas tuaj yeem hloov mus rau qhov chaw muaj zog? Txawm li cas los tsis muaj zog qhov chaw teeb ua tau ua hloov dua siab tshiab rau hauv lub koom haum muaj zog teeb los ntawm tsuas yog ntxiv cov yam ntxwv tsim nyog, qhov kev ua no ua rau rov ua dua ntawm qhov tseem ceeb. Qhov tseem ceeb ntawm a tsis muaj zog qhov chaw teeb ua tau yuav inferred los ntawm nws kev sib raug zoo nrog rau lub koom haum muaj zog teeb.
Tom qab ntawd, ib tug kuj yuav nug, dab tsi yog qhov chaw tsis muaj zog thiab qhov chaw muaj zog?
Cov qhov chaw teeb uas tsis muaj txaus attributes los tsim ib tug thawj key yog hu ua Qhov chaw tsis muaj zog teeb. Ib qhov chaw teeb uas muaj qhov tseem ceeb yog hu ua Qhov chaw muaj zog teeb.
Lub koom haum muaj zog yog dab tsi?
Kev txhais ntawm Strong Entity Cov Strong Entity yog ib tug uas nws existencedo tsis nyob ntawm lub hav zoov ntawm lwm yam qhov chaw hauv aschema. Nws yog denoted los ntawm ib daim duab plaub. A lub koom haum muaj zog ib txwm muaj tus yuam sij tseem ceeb hauv cov txheej txheem uas piav txog qhov lub koom haum muaj zog.
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