Yog tias koj paub cov ntawv nthuav dav zoo li Microsoft Excel, koj twb nkag siab tias cov ntaub ntawv siv tau li cas nrog cov ntxhuav. Databases kuj siv cov ntxhuav los khaws, tswj, thiab khaws cov ntaub ntawv.
Koj Twb Siv Databases
Koj yuav tsis paub nws tab sis koj ntsib lub zog ntawm cov ntaub ntawv txhua lub sijhawm hauv koj lub neej txhua hnub. Piv txwv li, thaum koj nkag mus rau hauv koj tus lej nyiaj hauv tuam txhab nyiaj hauv online, koj lub txhab nyiaj thawj zaug txheeb xyuas koj tus ID nkag mus siv koj tus username thiab password thiab tom qab ntawd qhia koj li nyiaj tshuav nyiaj li cas thiab kev ua lag luam. Cov ntaub ntawv ua haujlwm tom qab qhov xwm txheej ntsuas koj lub npe siv thiab tus password ua ke thiab muab kev nkag mus rau koj tus account. Nws mam li lim koj cov kev lag luam kom pom lawv raws hnub tim lossis hom, raws li koj thov.
Databases vs. Spreadsheets
Databases txawv ntawm cov ntawv nthuav qhia uas lawv tau zoo dua ntawm kev khaws cov ntaub ntawv ntau thiab siv nws ntau txoj hauv kev. Nov yog ob peb yam uas koj tuaj yeem ua nrog cov ntaub ntawv uas yuav nyuaj, yog tias tsis ua tsis tau, ua kom siv daim ntawv nthuav qhia:
- Retrieve tag nrho cov ntaub ntawv uas phim qee yam qauv
- Hloov kho cov ntaub ntawv hauv ntau
- Cross-reference records in different tables
- Ua cov lej suav tag nrho
Cov ntsiab lus ntawm Database
A database yog tsim los ntawm ntau lub rooj sib txawv. Zoo li Excel cov rooj, cov rooj database muaj cov kab thiab kab. Txhua kem sib raug rau tus cwj pwm thiab txhua kab sib raug rau ib qho ntaub ntawv.
Piv txwv li, xav txog lub rooj database uas muaj cov npe thiab tus lej xov tooj rau 50 tus neeg ua haujlwm ntawm Tuam Txhab X. Lub rooj tau teeb tsa nrog cov kab sau npe "Lub Npe," "LastName," thiab "Tebchaws Xov Tooj." Txhua kab muaj cov ntaub ntawv sib raug rau ib tus neeg. Vim tias muaj 50 tus neeg, lub rooj muaj 50 kab nkag thiab ib kab ntawv.
Txhua lub rooj hauv cov ntaub ntawv yuav tsum muaj lub npe tshwj xeeb thiab txhua tus yuav tsum muaj lub ntsiab lus tseem ceeb kom txhua kab (lossis cov ntaub ntawv) muaj qhov tshwj xeeb los txheeb xyuas nws.
Cov ntaub ntawv hauv cov ntaub ntawv muaj kev tiv thaiv los ntawm kev txwv, uas tswj cov cai ntawm cov ntaub ntawv kom ntseeg tau tias nws tag nrho kev ncaj ncees. Ib qho kev txwv tshwj xeeb ua kom ntseeg tau tias tus yuam sij tseem ceeb tsis tuaj yeem muab luam tawm. Ib daim tshev txwv tswj hom ntaub ntawv koj tuaj yeem nkag mus. Piv txwv li, Daim Ntawv Sau Npe tuaj yeem lees txais cov ntawv sau yooj yim, tab sis Daim Ntawv Sau Npe Xaus Saus yuav tsum suav nrog cov lej tshwj xeeb.
Ib qho tseem ceeb tshaj plaws ntawm cov ntaub ntawv yog lub peev xwm los tsim kev sib raug zoo ntawm cov ntxhuav siv cov yuam sij txawv teb chaws. Piv txwv li, tej zaum koj yuav muaj ib lub rooj Cov Neeg Siv Khoom thiab lub rooj txiav txim. Txhua tus neeg siv khoom tuaj yeem txuas rau qhov kev txiav txim hauv koj lub rooj Orders. Lub rooj Orders, nyob rau hauv lem, tej zaum yuav txuas mus rau ib lub rooj khoom. Txoj kev no ua kom yooj yim tsim database kom koj tuaj yeem npaj cov ntaub ntawv los ntawm qeb, tsis yog sim muab tag nrho cov ntaub ntawv rau hauv ib lossis ob peb lub rooj.
A Database Management System
A database tsuas tuav cov ntaub ntawv xwb. Txhawm rau siv cov ntaub ntawv no tiag tiag, koj xav tau kev tswj hwm database. DBMS yog lub database nws tus kheej, nrog rau cov software thiab functionality yuav tsum tau mus retrieve los yog ntxig cov ntaub ntawv. DBMS tsim cov ntawv ceeb toom, tswj cov kev cai database thiab txwv, thiab tswj cov txheej txheem database. Yog tsis muaj DBMS, ib lub database tsuas yog sau cov khoom thiab bytes nrog lub ntsiab lus me me.
Yog tias koj xav sim tsim cov ntaub ntawv, qhov chaw zoo pib yuav yog qhov kev pabcuam database zoo li Microsoft Access.
FAQ
Dab tsi yog database schema?
A database's schema yog nws cov qauv. Nws qhia meej tias cov ntaub ntawv twg, lossis cov khoom, tuaj yeem nkag mus rau hauv cov ntaub ntawv thiab txhais cov kev sib raug zoo ntawm lawv. Scheme feem ntau txhais tau tias siv Structured Query Language (SQL).
Dab tsi yog kev sib raug zoo database?
Ib qho kev sib raug zoo database khaws cov ntaub ntawv cov ntsiab lus uas muaj feem cuam tshuam rau ib leeg. Nws teeb tsa cov ntaub ntawv rau hauv ib lossis ntau lub rooj, txhua tus nrog tus yuam sij tshwj xeeb txheeb xyuas nws.
Cov lus nug database yog dab tsi?
Ib qho lus nug tsuas yog thov rau cov ntaub ntawv los ntawm cov ntaub ntawv. Cov ntaub ntawv tuaj yeem los ntawm ib lossis ntau lub rooj hauv cov ntaub ntawv, lossis tuaj yeem los ntawm lwm cov lus nug. Thaum twg koj ntaus hauv Google tshawb, koj tab tom xa cov lus nug, piv txwv li.
Dab tsi yog cov ntaub ntawv khaws tseg?
A cov ntaub ntawv yog cov ntaub ntawv khaws cia hauv lub rooj. Cov ntaub ntawv kuj qee zaum hu ua a tuple.
Tus yuam sij txawv teb chaws nyob rau hauv database yog dab tsi?
Ib tus yuam sij txawv teb chaws yog ib qho khoom sib txuas uas txuas cov ntaub ntawv hauv ob lub rooj ua ke. Tus yuam sij txawv teb chaws yog hais txog tus yuam sij tseem ceeb ntawm lwm lub rooj hu ua rooj niam txiv . Lub rooj uas muaj tus yuam sij txawv teb chaws hu ua rooj menyuam.
Dab tsi yog qhov chaw nyob hauv database?
Ib qho chaw yog ib yam khoom uas muaj nyob hauv cov ntaub ntawv. Nws tuaj yeem yog tus neeg, qhov chaw, chav tsev, lossis ib lub tswv yim paub daws teeb uas koj xav khaws cov ntaub ntawv hais txog. Piv txwv li, lub tsev kawm ntawv cov ntaub ntawv tuaj yeem muaj cov tub ntxhais kawm, cov kws qhia ntawv, thiab cov chav kawm ua cov koom haum.
