Video: Puas yog schema lub npe database?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
A database schema yog muaj los ntawm a database neeg siv thiab muaj tib yam npe raws li tus neeg siv npe . Ib qho kev sib txawv ntxiv yog ntawm lub cev database files "cov database "thiab" piv txwv" - cov software khiav uas ua rau lub cev ua haujlwm tag nrho.
Tsuas yog li ntawd, schema vs database yog dab tsi?
A schema txhais cov cwj pwm ntawm cov database , xws li rooj, kab, thiab khoom. A database schema yog ib qho kev piav qhia ntawm cov ntaub ntawv hauv a database . Thiab a database yog qhov khoom uas muaj tag nrho cov schemas koj tau tsim, thiab lawv cov ntaub ntawv ( thiab ib pawg ntawm predefined system cov neeg siv, rooj, views, thiab lwm yam.
Ib sab saum toj no, pes tsawg schemas nyob hauv ib lub database? Nws yuav tsum tau muab sau tseg tias yuav muaj tsuas yog ib lub tswv yim schema thiab ib sab hauv schema rau database . DBMS yog lub luag haujlwm rau kev kos duab ntawm peb hom no schema.
Qhov thib ob, lub npe schema hauv SQL Server yog dab tsi?
A schema yog ib phau ntawm cov khoom siv database xws li cov ntxhuav, views, triggers, khaws cov txheej txheem, indexes, thiab lwm yam. schema yog txuam nrog tus username uas yog hu ua tus schema tus tswv, uas yog tus tswv ntawm cov ntaub ntawv muaj feem xyuam nrog cov khoom siv. A schema ib txwm belongs rau ib lub database.
Qhov txawv ntawm ib lub schema thiab lub rooj yog dab tsi?
Ib database schema piav txog cov qauv thiab lub koom haum ntawm cov ntaub ntawv hauv a database system, thaum a rooj yog cov ntaub ntawv teev tseg hauv uas cov ntaub ntawv raug teeb tsa hauv rau ib pawg kab ntsug thiab kab rov tav. Lub database schema txhais cov tables hauv a database, kab thiab lawv hom.
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