Cov txheej txheem:
Video: Cov ntaub ntawv hom ICT yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Hom ntaub ntawv . Databases khaws cia cov ntaub ntawv . Txhawm rau ua kom cov ntaub ntawv muaj txiaj ntsig zoo, sib txawv hom ntawm cov ntaub ntawv feem ntau yog cais raws li ib qho ' hom ntaub ntawv '. > Cov ntawv lossis Alphanumeric - khw muag khoom cov ntaub ntawv uas suav nrog cov ntawv nyeem, cov cim thiab cov lej. Ib qho piv txwv yuav yog 'lub npe' e.g. John Smith.
Ib yam li ntawd, nws tau nug, Data ICT yog dab tsi?
Nyob rau hauv cov nqe lus ntawm ICT , cov ntaub ntawv tsuas yog txhua tus lej, ntawv lossis cov cim uas tuaj yeem nkag mus rau hauv lub khoos phis tawj. Cov ntaub ntawv qhov tseem ceeb tsis muaj lub ntsiab lus tshwj tsis yog tias peb muab lawv tso rau hauv cov ntsiab lus (cov ntsiab lus txhais tau tias yog qhov chaw lossis qhov xwm txheej).
Tom qab ntawd, lo lus nug yog, hom ntaub ntawv piav qhia nrog piv txwv yog dab tsi? Hom ntaub ntawv . A hom ntaub ntawv yog a hom ntawm cov ntaub ntawv . Qee yam hom ntaub ntawv suav nrog integers, floating point tooj, cim, hlua, thiab arrays. Tej zaum lawv kuj yuav hais meej dua hom , xws li hnub tim, timestamps, boolean qhov tseem ceeb, thiab varchar ( sib txawv tus cwj pwm) formats.
Khaws qhov no hauv kev txiav txim siab, koj txhais li cas los ntawm hom ntaub ntawv?
Hauv computer science thiab computer programming, a hom ntaub ntawv los yog yooj yim hom yog tus cwj pwm ntawm cov ntaub ntawv uas qhia rau compiler lossis tus neeg txhais lus li cas tus programmer npaj siab siv lub cov ntaub ntawv . Qhov no hom ntaub ntawv txhais cov kev ua haujlwm uas tuaj yeem ua tiav ntawm qhov cov ntaub ntawv , lub ntsiab lus ntawm cov ntaub ntawv , thiab txoj kev muaj nuj nqis ntawm qhov ntawd hom tuaj yeem khaws cia.
Cov ntaub ntawv sib txawv yog dab tsi?
Nkag siab Qualitative, Quantitative, Attribute, Discrete, thiab Nruam Cov Ntaub Ntawv Hom
- Nyob rau theem siab tshaj plaws, muaj ob hom ntaub ntawv muaj nyob: quantitative thiab qualitative.
- Muaj ob hom ntaub ntawv ntau, uas tseem hu ua cov ntaub ntawv xov tooj: nruam thiab tsis sib xws.
Pom zoo:
Cov ntaub ntawv hom thiab cov qauv ntaub ntawv yog dab tsi?
Cov qauv ntaub ntawv yog ib txoj hauv kev piav qhia txog ib txoj hauv kev los npaj cov ntaub ntawv kom ua haujlwm andalogrithms tuaj yeem siv tau yooj yim dua. Ib hom ntaub ntawv piav qhia txog cov ntaub ntawv uas txhua tus sib koom ua ke. Piv txwv li tus lej cov ntaub ntawv hom piav qhia txhua tus lej uas lub khoos phis tawj tuaj yeem ua tau
Dab tsi yog hom ntaub ntawv thiab cov ntaub ntawv sib txawv?
Qee cov ntaub ntawv muaj xws li cov lej, cov lej ntab, cov cim, cov hlua, thiab cov arrays. Lawv kuj tseem yuav yog hom tshwj xeeb, xws li hnub tim, timestamps, booleanvalues, thiab varchar (tus cwj pwm sib txawv) cov qauv
Dab tsi yog lub hom phiaj ntawm delimiters nyob rau hauv cov ntawv sau npe ob hom ntawv cov ntaub ntawv delimiters?
Cov ntaub ntawv delimited yog cov ntawv nyeem siv los khaws cov ntaub ntawv, uas txhua kab sawv cev rau ib phau ntawv, tuam txhab, lossis lwm yam, thiab txhua kab muaj cov teb sib cais los ntawm tus lej
Vim li cas kem taw qhia cov ntaub ntawv khaws cia ua cov ntaub ntawv nkag ntawm disks sai dua li kab qhia cov ntaub ntawv khaws cia?
Kem oriented databases (aka columnar databases) yog qhov tsim nyog rau kev ntsuas kev ua haujlwm ntau dua vim tias cov ntaub ntawv hom ntawv (kem hom) qiv nws tus kheej kom nrawm dua cov lus nug ua - scans, aggregation thiab lwm yam. Ntawm qhov tod tes, kab oriented databases khaws ib kab (thiab tag nrho nws. kab) contiguously
Dab tsi yog cov teeb meem ntawm kev tswj cov ntaub ntawv hauv cov ntaub ntawv ib txwm muaj?
Nyob rau tib lub sijhawm, qhov kev tswj hwm cov ntaub ntawv ib puag ncig tsim teeb meem xws li cov ntaub ntawv rov ua dua thiab tsis sib xws, cov kev pab cuam-cov ntaub ntawv dependence, inflexibility, tsis muaj kev ruaj ntseg, thiab tsis muaj cov ntaub ntawv sib qhia thiab muaj