Cov txheej txheem:

Kuv yuav ua li cas los tsim ib kem thawj tus yuam sij hauv SQL Server?
Kuv yuav ua li cas los tsim ib kem thawj tus yuam sij hauv SQL Server?

Video: Kuv yuav ua li cas los tsim ib kem thawj tus yuam sij hauv SQL Server?

Video: Kuv yuav ua li cas los tsim ib kem thawj tus yuam sij hauv SQL Server?
Video: Data Science with Python! Analyzing File Types from Avro to Stata 2024, Kaum ib hlis
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Siv SQL Server Management Studio

  1. Hauv Object Explorer, right-click lub rooj uas koj xav tau ntxiv ib qho kev txwv tshwj xeeb, thiab nyem Tsim.
  2. Hauv Table Designer, nyem kab xaiv rau cov ntaub ntawv kem koj xav txhais li tus thawj tus yuam sij .
  3. Right-click tus kab xaiv rau qhov kem thiab xaiv Set Lub Ntsiab Tseem Ceeb .

Kuj paub, kuv yuav ntxiv tus yuam sij li cas rau lub rooj uas twb muaj lawm?

Txhawm rau ntxiv cov yuam sij tseem ceeb siv Control Center:

  1. Nthuav cov khoom ntoo kom txog thaum koj pom Tables folder.
  2. Right-click lub rooj koj xav hloov kho, thiab xaiv Alter los ntawm cov ntawv qhia zaub mov pop-up.
  3. Ntawm nplooj ntawv Keys, xaiv ib lossis ntau kab ua tus yuam sij tseem ceeb.
  4. Yeem: Sau lub npe txwv ntawm tus yuam sij tseem ceeb.

Tsis tas li ntawd, yuav ua li cas thiaj tsim kab Identity hauv SQL Server? Tsim ib kem tus kheej los ntawm kev tsim lub rooj yam tsis muaj cov ntaub ntawv poob

  1. Tsim ib lub rooj ib ntus nrog rau kab ntawv tus kheej.
  2. Luam cov ntaub ntawv los ntawm thawj lub rooj rau hauv lub rooj ib ntus.
  3. Tso lub rooj qub.
  4. Rename lub rooj ib ntus mus rau lub npe lub rooj qub.

Tom qab ntawd, lo lus nug yog, dab tsi yog qhov tseem ceeb hauv SQL nrog piv txwv?

Tus yuam sij tseem ceeb yog qhov chaw hauv a rooj uas tshwj xeeb txheeb xyuas txhua kab / cov ntaub ntawv hauv cov ntaub ntawv rooj . Cov yuam sij tseem ceeb yuav tsum muaj cov txiaj ntsig tshwj xeeb. Ib kab ntawv tseem ceeb tsis tuaj yeem muaj NULL qhov tseem ceeb. A rooj tuaj yeem muaj tsuas yog ib qho tseem ceeb, uas yuav muaj xws li ib qho lossis ntau qhov chaw.

Peb puas tuaj yeem hloov kho qhov tseem ceeb?

Thaum tsis muaj dab tsi li yuav tiv thaiv koj ntawm hloov kho a thawj tus yuam sij (tshwj tsis yog kev txwv kev ncaj ncees), nws yuav tsis yog ib lub tswv yim zoo: Los ntawm kev ua tau zoo ntawm kev pom: Koj yuav xav tau hloov tshiab tag nrho txawv teb chaws cov yuam sij uas reference the hloov tshiab tus yuam sij . Ib leeg hloov tshiab tau coj mus rau hloov tshiab ntawm tej zaum muaj ntau lub rooj / kab.

Pom zoo: