Video: Ib lub koom haum puas yuav tsum muaj tus yuam sij?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Txhua qhov chaw yuav tsum muaj tus cwj pwm lossis tus cwj pwm, qhov tseem ceeb tus yuam sij , uas nws qhov tseem ceeb cim qhia txhua qhov piv txwv ntawm cov qhov chaw . Txhua tus menyuam qhov chaw yuav tsum muaj tus cwj pwm, txawv teb chaws tus yuam sij , uas ua kom tiav kev koom tes nrog niam txiv qhov chaw.
Ib yam li ntawd, ib lub koom haum puas tuaj yeem tsis muaj tus yuam sij tseem ceeb?
Tsim ib qho Qhov chaw Yam khoom rau lub rooj nrog Tsis muaj tus yuam sij tseem ceeb . Thaum koj txhais ib qho qhov chaw khoom, nws yuav tsum muaj a thawj tus yuam sij lossis siv RowID tus cwj pwm (raws li lub rooj ROWID). Yog tias koj tsim lub neej ntawd qhov chaw khoom los ntawm lub rooj nrog tsis muaj qhov tseem ceeb , RowID attribute yog cia li tsim raws li tus thawj tus yuam sij.
Ib sab saum toj no, ib lub koom haum puas tuaj yeem muaj ob lub ntsiab lus tseem ceeb? Ib lub rooj tuaj yeem muaj ib leeg xwb thawj tus yuam sij , uas tej zaum yuav muaj ib leeg los yog ntau teb. Thaum twg ntau teb yog siv raws li ib tug thawj tus yuam sij , lawv hu ua composite tus yuam sij . Yog ib rooj muaj a thawj tus yuam sij txhais nyob rau hauv ib qho chaw (s), ces koj ua tsis tau muaj ob cov ntaub ntawv muaj tib tus nqi ntawm daim teb ntawd.
Hais txog qhov no, dab tsi yog qhov tseem ceeb ntawm qhov chaw?
Ib tus yuam sij yog ib qho cuab yeej los yog ib qho cuab yeej ntawm ib qho qhov chaw hom uas siv los txiav txim tus kheej. Cov khoom uas ua rau ib qho tus yuam sij raug xaiv ntawm lub sijhawm tsim. Cov nqi ntawm tus yuam sij cov khoom yuav tsum cim qhia ib tug qhov chaw ntaus piv txwv hauv ib qhov chaw teem rau lub sij hawm khiav.
Lub ntsiab lus twg yog qhov tsis muaj nyob hauv qhov chaw tsis muaj zog?
Hauv ib kev sib txheeb database , ib qho chaw tsis muaj zog yog ib qho chaw uas tsis tuaj yeem txheeb xyuas los ntawm nws cov cwj pwm ib leeg; yog li ntawd, nws yuav tsum siv a txawv teb chaws key ua ke nrog nws cov cwj pwm los tsim ib qho thawj tus yuam sij . Cov txawv teb chaws key feem ntau yog a thawj tus yuam sij ntawm ib lub koom haum nws muaj feem xyuam nrog.
Pom zoo:
Ib tus yuam sij tseem ceeb puas tuaj yeem muaj ob tus yuam sij txawv teb chaws?
Nws yog qhov zoo kawg nkaus kom muaj ob kab ntawv tseem ceeb txawv teb chaws xa mus rau tib lub ntsiab lus tseem ceeb hauv ib lub rooj sib txawv vim tias txhua tus nqi tseem ceeb txawv teb chaws yuav siv cov ntaub ntawv sib txawv hauv cov lus hais
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Puas yog tus yuam sij tseem ceeb kuj yog tus yuam sij txawv teb chaws?
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Ib tus yuam sij txawv teb chaws puas tuaj yeem siv lwm tus yuam sij txawv teb chaws?
1 Teb. Tus yuam sij txawv teb chaws tuaj yeem siv txhua qhov chaw uas txhais tau tias nws txawv. Yog hais tias qhov tshwj xeeb teb yog nws tus kheej txhais tau tias yog tus yuam sij txawv teb chaws, nws tsis txawv. Yog tias nws yog thaj chaw tshwj xeeb, nws kuj tuaj yeem yog lub hom phiaj ntawm lwm FK