Cov txheej txheem:

Yuav ua li cas koj npaj ib tug database schema?
Yuav ua li cas koj npaj ib tug database schema?

Video: Yuav ua li cas koj npaj ib tug database schema?

Video: Yuav ua li cas koj npaj ib tug database schema?
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Anonim

Tus txheej txheem tsim muaj cov kauj ruam hauv qab no:

  1. Txiav txim siab lub hom phiaj ntawm koj database .
  2. Nrhiav thiab teeb tsa cov ntaub ntawv xav tau.
  3. Muab cov ntaub ntawv faib ua cov rooj.
  4. Tig cov ntaub ntawv rau hauv kab.
  5. Qhia cov yuam sij tseem ceeb.
  6. Teem lub rooj kev sib raug zoo.
  7. Refine koj tsim .
  8. Siv cov kev cai normalization.

Ib yam li ntawd, koj tuaj yeem nug, Kuv yuav ua li cas thiaj tsim tau lub database schema?

Rau tsim a schema Right-click lub Security folder, taw tes rau Tshiab, thiab xaiv Schema . Hauv Schema - Tshiab dialog box, ntawm nplooj ntawv General, sau ib lub npe rau tus tshiab schema hauv Schema npe box. Hauv Schema tus tswv lub thawv, sau lub npe ntawm a database tus neeg siv lossis lub luag haujlwm los ua tus tswv schema.

Tom qab ntawd, lo lus nug yog, dab tsi yog qhov piv txwv ntawm schema? Schema , hauv kev tshawb fawb txog kev sib raug zoo, cov qauv kev puas siab puas ntsws uas ib tus neeg siv los npaj kev paub thiab qhia cov txheej txheem kev txawj ntse thiab tus cwj pwm. Piv txwv ntawm schemata muaj xws li rubrics, perceived social luag hauj lwm, stereotypes, thiab worldviews.

Hais txog qhov no, dab tsi yog qhov schema hauv database?

Database schema . Lub sij hawm " schema " yog hais txog lub koom haum ntawm cov ntaub ntawv raws li ib tug blueprint ntawm yuav ua li cas lub database yog tsim (sib faib ua database rooj nyob rau hauv rooj plaub ntawm kev sib raug zoo databases ). Lub ntsiab txhais ntawm a database schema yog ib txheej ntawm cov qauv (cov kab lus) hu ua integrity constraints imposed on a database.

Qhov piv txwv database schema yog dab tsi?

A schema muaj schema cov khoom, uas tuaj yeem yog cov ntxhuav, kab, cov ntaub ntawv hom, kev pom, cov txheej txheem khaws cia, kev sib raug zoo, cov yuam sij tseem ceeb, cov yuam sij txawv teb chaws, thiab lwm yam. schema daim duab sawv cev rau peb lub rooj me me database . Saum toj no yog ib qho yooj yim piv txwv ntawm a schema daim duab.

Pom zoo: