Video: Cov ntaub ntawv xaiv dab tsi hauv Visual Basic?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
A Xaiv Case nqe lus tso cai rau qhov sib txawv los sib tw rau kev sib npaug ntawm cov npe ntawm cov txiaj ntsig. Txhua tus nqi yog hu ua cas , thiab qhov sib txawv ntawm qhov hloov pauv tau raug kuaj xyuas foreach xaiv rooj plaub.
Hauv qhov no, nqe lus kawg ntawm kev xaiv rooj plaub yog dab tsi?
Yog tias testexpression phim cov expressionlist txuam nrog a Case clause, ua nqe lus block tom qab ntawd Case clause yog executed mus rau tom ntej Case clause, los yog rau qhov kawg, mus txog Xaus Xaiv . Control cespasses rau lub nqe lus raws li EndSelect.
Ib yam li ntawd, cov lus hloov pauv ua haujlwm li cas? Lub cev ntawm a hloov nqe lus yog lub npe hu ua a hloov thaiv. A nqe lus hauv hloov blockcan tau sau nrog ib lossis ntau dua cas los yog default labels. Cov hloov nqe lus ntsuam xyuas nws cov lus qhia, ces executes tag nrho nqe lus uas ua raws li kev sib tw cas daim ntawv lo.
Tsuas yog li ntawd, dab tsi yog qhov kev nthuav qhia?
CAS cov lus qhia pub ib kev qhia los xaiv raws li qhov kev ntsuam xyuas ntawm ib lossis ntau qhov xwm txheej. cas - kev qhia.
Koj puas tuaj yeem siv CASE nqe lus hauv kev nkag mus?
Lub Microsoft Access Case nqe lus tuaj yeem tsuas yog beused hauv VBA code. Nws muaj qhov ua haujlwm ntawm IF-THEN-ELSE nqe lus.
Pom zoo:
Dab tsi yog cov ntaub ntawv hloov pauv hauv cov ntaub ntawv khaws cia?
Cov ntaub ntawv hloov pauv yog cov ntaub ntawv uas tau tsim nyob rau hauv daim ntawv thov kev sib ntsib, uas tsis tau khaws cia hauv cov ntaub ntawv tom qab daim ntawv thov raug txiav
Dab tsi yog kev noj cov ntaub ntawv hauv cov ntaub ntawv loj?
Cov ntaub ntawv ingestion yog tus txheej txheem ntawm tau txais thiab import cov ntaub ntawv rau tam sim ntawd siv los yog cia nyob rau hauv ib tug database. Txhawm rau noj ib yam dab tsi yog 'coj ib yam dab tsi los yog nqus ib yam dab tsi.' Cov ntaub ntawv tuaj yeem xa tawm hauv lub sijhawm tiag tiag lossis noj hauv cov khoom siv
Dab tsi yog cov ntaub ntawv thev naus laus zis hauv kev tswj cov ntaub ntawv xov xwm?
Kev tswj cov ntaub ntawv xov xwm (MIS) yog hais txog cov txheej txheem loj siv los ntawm kev lag luam lossis kev lag luam, thaum cov ntaub ntawv thev naus laus zis (IT) yog ib feem ntawm cov txheej txheem uas siv los sau thiab xa cov ntaub ntawv. Cov Ntaub Ntawv Technology txhawb nqa thiab pab txhawb kev ua haujlwm ntawm qhov system ntawd
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