Video: Dab tsi yog Data Oxford phau ntawv txhais lus?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
/ˈdæt??/ 1 (siv los ua ib tug plural noun intechnical English, thaum lub singular yog datum) [uncountable, plural] cov lus tseeb los yog cov ntaub ntawv, tshwj xeeb tshaj yog thaum soj ntsuam thiab siv los nrhiav tej yam los yog txiav txim siab no cov ntaub ntawv tau sau los ntawm 69 lub teb chaws.
Cov lus nug tseem yog, koj txhais li cas los ntawm phau ntawv txhais lus cov ntaub ntawv?
A cov ntaub ntawv phau ntawv txhais lus yog ib cov ntaub ntawv los yog ib txheej ntawm cov ntaub ntawv uas muaj ib tug database metadata. Cov cov ntaub ntawv phau ntawv txhais lus muaj cov ntaub ntawv hais txog lwm yam khoom hauv database, xws li cov ntaub ntawv kev ua tswv cuab, cov ntaub ntawv kev sib raug zoo rau lwm yam khoom, thiab lwm yam cov ntaub ntawv . Cov cov ntaub ntawv phau ntawv txhais lus yog ib qho tseem ceeb ntawm cov ntaub ntawv sib raug zoo.
Kuj Paub, puas yog cov ntaub ntawv no lossis cov ntaub ntawv no? Hauv txoj kev xav, thiab ua raws li cov cai ntawm Latingrammar thiab cov lus Askiv ib txwm muaj, cov ntaub ntawv yog ib tug plural noun (piv txwv li " Cov ntaub ntawv no tsis meej pem”). Txawm li cas los xij, cov ntaub ntawv yog niaj hnub no feem ntau kho raws li ib tug uncountable pawg noun, tshwj xeeb tshaj yog nyob rau hauv niaj hnub siv (piv txwv li "Qhov no cov ntaub ntawv tsis meej pem”).
Kuj paub, dab tsi yog lub ntsiab lus ntawm cov ntaub ntawv?
Cov ntaub ntawv raws li lub tswv yim dav dav hais txog qhov tseeb tias qee cov ntaub ntawv uas twb muaj lawm lossis kev paub yog sawv cev lossis coded hauv qee daim ntawv tsim nyog rau kev siv zoo dua lossis ua tiav. Raw cov ntaub ntawv ("unprocessed cov ntaub ntawv ") yog ib phau ntawm cov lej orcharacters ua ntej nws tau "huv" thiab kho los ntawm cov kws tshawb fawb.
Puas yog lo lus cov ntaub ntawv tus kheej lossis ntau tshaj?
Qhov no yeej muaj tseeb nrog rau cov ntaub ntawv lo lus . Raws li qhia hauv Phau Ntawv Qhia Tshaj Tawm (p. 96), lub lus dat yog yam lus , thiab cov cov ntaub ntawv lo lus yog ntau tshaj . Plural npe take ntau tshaj lus, so cov ntaub ntawv yuav tsum ua raws li a ntau tshaj lus qhia.
Pom zoo:
Dab tsi yog cov ntaub ntawv phau ntawv txhais lus hauv kev txheeb xyuas kev lag luam?
Cov Ntawv Txhais Lus Cov Ntaub Ntawv yog RML cov qauv ntaub ntawv uas khaws cov ntsiab lus ntawm qib teb txog cov ntaub ntawv hauv ib qho system lossis cov tshuab. Thaum lub sij hawm qhov yuav tsum tau ua, lub hom phiaj tsis yog ntawm cov ntaub ntawv tiag tiag hauv cov ntaub ntawv lossis kev tsim qauv tsim nyog los siv cov khoom lag luam cov ntaub ntawv hauv cov ntaub ntawv
Dab tsi yog cov txiaj ntsig ntawm phau ntawv txhais lus cov ntaub ntawv?
Ib phau ntawv txhais lus tau tsim muaj tuaj yeem muab cov koom haum thiab kev lag luam ntau cov txiaj ntsig, suav nrog: Txhim kho cov ntaub ntawv zoo. Txhim kho kev ntseeg siab ntawm cov ntaub ntawv ncaj ncees. Txhim kho cov ntaub ntawv thiab kev tswj xyuas. Txo cov ntaub ntawv redundancy. Rov qab siv cov ntaub ntawv. Kev sib raug zoo ntawm kev siv cov ntaub ntawv. Kev txheeb xyuas cov ntaub ntawv yooj yim dua. Txhim kho kev txiav txim siab raws li cov ntaub ntawv zoo dua
Dab tsi yog cov ntaub ntawv phau ntawv txhais lus hauv kev txheeb xyuas thiab tsim qauv?
Cov ntaub ntawv phau ntawv txhais lus. Los ntawm Systems Analysis and Design: A Structured Approach: A data Dictionary is a collection of data about data. Nws tuav cov ntaub ntawv hais txog kev txhais, qauv, thiab kev siv ntawm txhua cov ntaub ntawv uas lub koom haum siv. Muaj ntau tus cwj pwm uas yuav khaws cia txog cov ntaub ntawv keeb
Dab tsi yog cov txiaj ntsig tseem ceeb ntawm kev siv phau ntawv txhais lus cov ntaub ntawv?
Ib phau ntawv txhais lus tsim tau tuaj yeem muab cov koom haum thiab cov lag luam muaj txiaj ntsig ntau, suav nrog: Txhim kho cov ntaub ntawv zoo. Txhim kho kev ntseeg siab ntawm cov ntaub ntawv ncaj ncees. Txhim kho cov ntaub ntawv thiab kev tswj xyuas. Txo cov ntaub ntawv redundancy. Rov qab siv cov ntaub ntawv. Kev sib raug zoo ntawm kev siv cov ntaub ntawv. Kev txheeb xyuas cov ntaub ntawv yooj yim dua. Txhim kho kev txiav txim siab raws li cov ntaub ntawv zoo dua
Dab tsi yog hom ntaub ntawv phau ntawv txhais lus?
Muaj ob hom ntaub ntawv phau ntawv txhais lus – Active thiab Passive