Yuav ua li cas hom ntawm databases muaj nyob niaj hnub no?

Txhua ntau lub sij hawm hnov xws li ib tug kab lus raws li "database." Yog li ntawd yog dab tsi lawv? Databases - nws yog ib cov lus qhia ua qauv uas yuav siv tau los cia ntaub ntawv nyob rau hauv ib tug ncaj qha kev yam. Tsis tas li ntawd nrog rau lawv cov kev pab nws yog tau khaws cov ntaub ntawv txog tej khoom, tej txiaj ntsim nrog uas zoo sib xws zog.

Yuav kom tsim ib tug tshiab database, koj yuav tsum xub xyuas seb hom thiab cov ntaub ntawv lug siv nyob rau hauv nws (txwv tsis pub koj yuav tsis tau txais raws nraim li cas yuav tsum tau, vim hais tias cov ntaub ntawv muaj nyob rau hauv lub databases yuav tsum tau cob qhia).

Cov nram qab no yog tam sim no siv database: network, tabular thiab hierarchical. Ntawm cov hoob kawm, nyob rau hauv ntau lub respects vim cov kev xaiv ntawm tus kheej nyiam thiab cov specifics ntawm cov ntaub ntawv uas cov chaw ua hauj lwm yog nqa tawm.

Cov feem nrov hom - tabular database. Lawv muaj xws li ib tug yooj yim daim ntawv teev cov yam khoom uas muaj ib tug zoo li hom, nyob rau hauv lwm yam lus, tej khoom, tej txiaj ntsim nrog tib yam khoom. Qhov no hom ntawm tus thawj coj kuj vim hais tias tso cai rau koj mus siv rau compiling databases tsawg npaum li cas lub sij hawm. Databases ntawm no zoo muaj peev xwm yuav formulated siv tib lub Excel, nyob rau hauv uas lub ntsiab lub qhov rais ntawm lub cell yuav tsum muab rau tag nrho cov hom ntawm spreadsheet cov ntaub ntawv, namely ntawv nyeem, cov qauv thiab cov xov tooj.

Tsis tas li ntawd, tabular database yuav tuaj raws li ib tug yooj yim ob-dimensional lub rooj. Ib kab ib kab ntawm cov lus no yog lawm ua tus sau successively qhov tseem ceeb ntawm ib tug kwv thiab cov khoom tseem ceeb yog qhia li no nyob rau hauv nws txhua.

Lawv tus kheej ntawm tej kab ntawm lub rooj yog hu ua teb. Tag nrho cov teb cim nrog txawv npe thiab muaj cov ntaub ntawv qhia cov kev kawm parameter muaj nuj nqis.

Nyob rau hauv no hais txog, cia peb rov qab ib zaug dua hais tias yog peb cais hom databases rau qhov yooj yim ntawm kev tsim thiab sau cov database rooj yuav nyob hauv thawj qhov chaw xwb vim hais tias ntawm cov cuab yeej no.

Ntaubntawv povthawj siv ntawm cov kwv - tus naming ntawm tus neeg kab ntawm lub database rooj. Koj cov ntaub ntawv software raug muab faib ua ob peb teb nrog kev pab los ntawm cov lus txhua, yog li tag nrho cov ntaub ntawv - nws teev yuav tsum tau qhov tseem ceeb muaj nyob rau hauv lub teb.

Yog hais tias peb yuav tau xav txog lwm yam databases, tab sis tam sim no yuav tau piav qhia txog lub ntau npaum li cas txog cov nqe lus. Rau tib lub, los mus piav qhia ib lub rooj puag, thiab peb uas ploj lawm. Lub fact tias xws li cov ntaub ntawv thiab teb cov kwv, peb twb kawm lawm, thiab tam sim no ua kom paub lub ntsiab txhais ntawm lub ntsiab teb.

Tus yuam sij teb no yog xa mus rau raws li ib tug ntawm cov teb ntawm lub rooj, tus nqi yog muab nyob rau hauv uas uas characterizes tej ntaub ntawv uas muaj nyob rau hauv rooj hlwb.

Ntsiab teb feem ntau muaj ib cov ntaub ntawv hom hom "counter". Tsawg zaus, cov nram qab no cov ntaub ntawv hom yog siv: "accession tus xov tooj", "cov khoom code", thiab lwm yam ...

Lub hom teb rau lawv tus kheej feem ntau yog txiav txim los ntawm cov ntaub ntawv uas lawv muaj. Lub ntsiab yam ntawm "counter", "nyeem", "tus xov tooj", "hnub / lub sij hawm", "cov nyiaj ntsuab", "zajlus kom", "url".

Txhua yam yog siv, raws li nyob rau hauv dab tsi yog yuav tsum tau tshwm sim. Nws yog ntxhais Khana-as pom zoo, siv ib yam ntawm "url" nyob qhov twg tsim nyog xaiv "Hnub / lub sij hawm". Yog hais tias koj ua xws li ib tug hloov, ces tag nrho cov ua hauj lwm yuav mus, raws li lawv hais tias, tsis ncaj ncees lawm, nrog rau cov tshwm sim hais tias cov ntaub ntawv yuav tsum xam incorrectly.

Uas yog vim li cas peb yuav tsum paub qhov txawv ntawm tus neeg hom ntawm databases thiab teb yam yog sawv cev nyob rau hauv lawv.