Relational database schema hauv DBMS yog dab tsi?
Relational database schema hauv DBMS yog dab tsi?

Video: Relational database schema hauv DBMS yog dab tsi?

Video: Relational database schema hauv DBMS yog dab tsi?
Video: Lec 4: Functional dependency in DBMS | What is functional dependency | Database Management System 2024, Kaum ib hlis
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A Relational database schema yog cov ntxhuav, kab thiab kev sib raug zoo uas txuas ua ke cov khoom hauv ib database . A Relational database schema yog cov ntxhuav, kab thiab kev sib raug zoo uas ua rau a Relationaldatabase.

Dhau li ntawm no, dab tsi yog kev sib txheeb schema hauv database?

A kev sib txheeb schema qhia txog qhov database kev sib raug zoo thiab cov qauv hauv a kev sib txheeb database qhov kev pab cuam. Nws tuaj yeem nthuav tawm duab lossis sau rau hauv Cov Lus Nug Lus Nug (SQL) siv los tsim cov ntxhuav hauv kev sib txheeb database.

Kuj Paub, qhov sib txawv ntawm lub database schema thiab lub xeev database yog dab tsi? Qhov yooj yim qhov sib txawv ntawm ob lub ntsiab lus, schema thiab database lus dag hauv lawv definitioni.e. database yog ib qho kev sau ntawm qhov tseeb lossis cov ntaub ntawv hais txog cov khoom raug txiav txim siab. Ntawm qhov tod tes, Schema yog astructural sawv cev ntawm tag nrho database.

Kuj kom paub yog, dab tsi yog txhais los ntawm Schema hauv DBMS?

Ib database schema yog lub cev pob txha uas sawv cev rau qhov kev xav pom ntawm tag nrho cov ntaub ntawv. Nws txhais tau li cas cov ntaub ntawv raug teeb tsa thiab yuav ua li cas kev sib raug zoo ntawm lawv thaj chaw koom nrog. Nws tsim tag nrho cov kev txwv uas yuav tsum tau siv rau ntawm cov ntaub ntawv.

Dab tsi yog schema thiab nws hom?

Kev txhais ntawm schema : Tsim cov database iscalled lub schema . Schema yog ntawm peb hom : Lub cev schema , logical schema thiab saib schema . Piv txwv li: Hauv tus nram qab no daim duab, wehave a schema uas qhia tus Kev sib raug zoo ntawm peb lub rooj: Chav Kawm, Tub Ntxhais Kawm thiab Tshooj.

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