2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Rau cov koom haum uas xav tau khaws cov ntaub ntawv xav tau, cov qauv tsim nrog tus naj npawb ntawm cov tib neeg lossis cov ntawv thov nkag mus rau nws, cov ntaub ntawv sib txheeb tseem yog qhov kev xaiv zoo tshaj plaws.
Puas muaj kev sib txheeb database tsim nyog?
Cov txiaj ntsig. Qhov txiaj ntsig tseem ceeb ntawm kev sib raug zoo database yog muaj peev xwm tsim cov ntaub ntawv muaj txiaj ntsig los ntawm kev koom nrog cov rooj. Kev koom nrog cov ntxhuav tso cai rau koj nkag siab txog kev sib raug zoo ntawm cov ntaub ntawv, lossis cov rooj sib txuas li cas. SQL suav nrog lub peev xwm suav, ntxiv, pab pawg, thiab tseem muab cov lus nug.
Kev sib txheeb database siv rau dab tsi?
Ib qho kev sib raug zoo database yog ib hom database uas khw muag khoom thiab muab kev nkag mus rau cov ntaub ntawv cov ntsiab lus uas cuam tshuam rau ib leeg. Relational databases yog raws li tus qauv kev sib raug zoo, ib qho kev nkag siab, ncaj nraim ntawm kev sawv cev cov ntaub ntawv hauv cov ntxhuav.
Yuav database tsis muaj kev sib raug zoo?
Cov ntaub ntawv tsis sib xws, lossis NoSQL database, khaws cov ntaub ntawv. Txawm li cas los xij, tsis zoo li cov ntaub ntawv sib raug zoo, tsis muaj cov ntxhuav, kab, thawj cov yuam sij lossis cov yuam sij txawv teb chaws. Hloov chaw, cov ntaub ntawv tsis sib xws siv cov qauv khaws cia kom zoo rau cov kev cai tshwj xeeb ntawm hom ntaub ntawv khaws cia.
Vim li cas kev sib txheeb database nrov tshaj?
Virtually tag nrho cov kev sib raug zoo database systems siv SQL (Structured Query Language) ua hom lus rau querying thiab tswj cov database. Yog vim li cas rau dominance ntawmRelational databases yog: simplicity, robustness, yooj, kev ua tau zoo, scalability thiab compatibility nyob rau hauv kev tswj cov ntaub ntawv generic.
Pom zoo:
Cov ntaub ntawv qhia ntawv puas txhawb nqa cov ntaub ntawv kawm?
Cov ntaub ntawv qhia yuav tsum txhawb nqa txoj kev kawm lub tswv yim, cov hom phiaj thiab cov hom phiaj ntawm Cheeb Tsamthiab cov hom phiaj ntawm cov ntaub ntawv kawm uas cov ntaub ntawv yuav raug siv. … Cov ntaub ntawv qhia yuav tsum ua tau raws li cov qauv zoo ntawm cov ntsiab lus tseeb thiab kev nthuav qhia.
Thaum cov ntaub ntawv tshiab cuam tshuam nrog kev muab cov ntaub ntawv qub no hu ua?
Nrog retroactive cuam tshuam, cov ntaub ntawv tshiab cuam tshuam lub peev xwm rov qab cov ntaub ntawv qub. Nrog kev cuam tshuam tsis zoo, nws yog qhov rov qab: cov ntaub ntawv qub cuam tshuam qhov rov qab los ntawm cov ntaub ntawv tshiab tau kawm.
Puas yog cov ntaub ntawv sib tw cov ntaub ntawv raug cai?
Kev tsim "Cov ntaub ntawv cog lus" yog cov ntaub ntawv sau uas txhais lub luag haujlwm, kev lav phib xaub, thiab "Ua haujlwm" raws li Daim Ntawv Cog Lus Tsim Kho, thiab raug cai lij choj rau ob tog (Tswj thiab tus neeg cog lus).
Lub tuam txhab twg xav tau kev txheeb xyuas tus tuav ntaub ntawv?
Txhua lub tuam txhab npe. Txhua lub tuam txhab pej xeem muaj peev txheej them nyiaj ntawm tsib caug crore rupees lossis ntau dua; Txhua lub tuam txhab pej xeem muaj kev lag luam ntawm ob puas tsib caug crore rupees lossis ntau dua; los yog.
Cov ntaub ntawv twg muaj cov ntaub ntawv bituminous?
Nws muaj ob chav kawm ntawm cov khoom siv bituminous: (1) asph alt; thiab (2) tar. Cov ntaub ntawv no feem ntau yog siv los ua dej-pov thawj sealants, thiab ua cov ntaub ntawv los tuav cov aggregate ua ke nyob rau hauv bituminous pavements. Dab tsi yog cov khoom siv bituminous?
