Cov txheej txheem:
Video: Dab tsi yog hom ntaub ntawv nyuaj hauv DBMS?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
hom ntaub ntawv complex - Computer txhais
Ib qho cov ntaub ntawv uas tsis poob rau hauv cov qauv teb (alpha, numeric, dates) ntawm kev sib raug zoo DBMS . Piv txwv ntawm hom ntaub ntawv complex yog cov nqi ntawm cov ntaub ntawv, cov ntaub ntawv ua cov lus, daim ntawv qhia, lub sij hawm-series, cov duab thiab video.
Ib yam li ntawd, koj tuaj yeem nug, dab tsi yog cov ntaub ntawv nyuaj?
Cov ntaub ntawv nyuaj analytics hais txog kev siv cov txheej txheem algorithmic siab heev los ua cov txheej txheem loj cov ntaub ntawv teev ua tau zoo. Peb hu qhov no cov ntaub ntawv analytics, uas yog siv computers los soj ntsuam cov ntaub ntawv thiab nrhiav cov qauv muaj txiaj ntsig hauv nws uas tuaj yeem siv los txiav txim siab.
Tsis tas li ntawd, hom ntaub ntawv nyuaj hauv Java yog dab tsi? Siv a hom ntaub ntawv complex as a java ua khoom. Pab neeg ua haujlwm. A cov ntaub ntawv nyuaj object yog a hom ntaub ntawv uas tau raug txhais nyob rau hauv Bonita Studio thiab exported raws li ib tug. jar lub. xsd pob mus rau qhov chaw ua haujlwm. Nws tuaj yeem raug xa rov qab rau hauv Bonita Studio rau cov txheej txheem lossis ua haujlwm.
Kuj paub, dab tsi yog qhov khoom siv hauv database?
Cov khoom nyuaj . Qhov yooj yim tshaj plaws khoom yog khoom xws li integers, cim, byte hlua ntawm txhua qhov ntev, booleans thiab ntab (ib qho yuav ntxiv lwm hom atomic). Muaj ntau yam complex khoom constructors: tuples, poob lawm, hnab, npe, thiab arrays yog piv txwv.
Dab tsi yog hom ntaub ntawv hauv SQL?
SQL cov ntaub ntawv hom tuaj yeem muab faib ua ntau pawg hauv qab no
- Cov ntaub ntawv naj npawb xws li int, tinyint, bigint, ntab, tiag thiab lwm yam.
- Hnub thiab Lub Sijhawm cov ntaub ntawv xws li Hnub, Lub Sijhawm, Hnub Nyoog thiab lwm yam.
- Cim thiab hlua cov ntaub ntawv hom xws li char, varchar, ntawv nyeem thiab lwm yam.
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 cov ntaub ntawv nyuaj hauv npua?
Hom complex. Npua muaj peb hom ntaub ntawv complex: maps, tuples, thiab hnab. Tag nrho cov hom no tuaj yeem muaj cov ntaub ntawv ntawm txhua hom, suav nrog lwm hom kev nyuaj. Yog li nws muaj peev xwm muaj ib daim ntawv qhia uas tus nqi teb yog ib lub hnab, uas muaj ib tug tuple qhov twg ib daim teb yog daim ntawv qhia
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