Video: Dab tsi yog ntau hom ntaub ntawv?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Taw qhia rau Hom ntaub ntawv . Categorical Cov ntaub ntawv (Nominal, Ordinal) Tus lej Cov ntaub ntawv (Discrete, Nruam, Interval, Ratio) Yog vim li cas Hom ntaub ntawv tseem ceeb?
Tib neeg kuj nug, cov ntaub ntawv sib txawv yog dab tsi?
Hauv kev txheeb cais, muaj plaub cov ntaub ntawv ntsuas ntsuas: nominal, ordinal, interval thiab ratio. Cov no tsuas yog txoj hauv kev kom sub-categorize ntau hom ntaub ntawv (Ntawm no yog anoverview of statistical hom ntaub ntawv ).
Tsis tas li ntawd, 5 hom ntaub ntawv yog dab tsi? Hom ntaub ntawv uas muaj xws li:
- tus lej.
- cov booleans.
- cov cim.
- floating point tooj.
- alphanumeric cov hlua.
Ib yam li ntawd, cov ntaub ntawv yog dab tsi thiab hom ntaub ntawv yog dab tsi?
Computers siv ntau yam ntau hom ntaub ntawv khaws cia cov hom ntawv digital, xws li ntawv nyeem, lej thiab multimedia. Cov ntaub ntawv tau teeb tsa hauv cov rooj sib tham, thiab cov txheej txheem kev tswj hwm database yog siv los ua haujlwm nrog cov ntaub ntawv loj. Kev nkag siab zoo ntawm cov ntaub ntawv tso cai rau koj los npaj nws rau hauv cov ntaub ntawv tseem ceeb.
Ob hom ntaub ntawv yog dab tsi?
Cov Ob Main Flavors ntawm Cov ntaub ntawv : Qualitative thiab Quantitative Nyob rau theem siab tshaj, ob hom ntawm cov ntaub ntawv muaj nyob: quantitative and qualitative. Muaj nuj nqis cov ntaub ntawv suav nrog cov lej thiab yam uas koj tuaj yeem ntsuas lub hom phiaj: qhov ntev xws li qhov siab, qhov dav, thiab ntev. Kub thiab humidity.
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
Dab tsi yog hom ntaub ntawv thiab piav qhia nws hom?
Hom ntaub ntawv. Ib hom ntaub ntawv yog hom ntaub ntawv. Qee cov ntaub ntawv muaj xws li cov lej, cov lej ntab, cov cim, cov hlua, thiab cov arrays. Tej zaum lawv kuj yuav yog hom tshwj xeeb, xws li hnub tim, timestamps, boolean qhov tseem ceeb, thiab varchar (tus cwj pwm txawv)
Hom ntaub ntawv twg ntawm Hadoop tso cai rau columnar cov ntaub ntawv cia hom?
Columnar ntaub ntawv tawm tswv yim (Parquet, RFile) Qhov tseeb hotness nyob rau hauv cov ntaub ntawv tawm tswv yim rau Hadoop iscolumnar cov ntaub ntawv cia. Yeej qhov no txhais tau hais tias tsis yog cia li khaws cov kab ntawm cov ntaub ntawv nyob ib sab rau ib leeg koj kuj khaws cov kab ntawv nyob ib sab. Yog li datasets tau muab faib ua ob qho tib si horizontally thiab vertically