Cov txheej txheem:
Video: Dab tsi yog qhov hloov tshiab thiab tso cov lus nug ua dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2024-01-18 08:24
qhov tsim nyog syntax thiab siv cov lus txib no yog raws li hauv qab no
- INSERT :→ ntxig yog cov lus txib hauv oracle SQL uas yog siv rau ntxig sau rau hauv lub rooj.
- Hloov tshiab :→ Hloov tshiab yog siv los hloov cov ntaub ntawv qub / cov ntaub ntawv nrog cov ntaub ntawv tshiab.
- DROP :→ Tso yog siv los tshem tawm tag nrho cov lus los ntawm database nrog lub rooj
Ntawm no, peb puas tuaj yeem sau ntxig hloov tshiab rho tawm hauv kev ua haujlwm?
Tsis yog, koj ua tau tsis yog ua Insert / Hloov tshiab / Rho tawm . Muaj nuj nqi tsuas yog ua haujlwm nrog cov lus xaiv. Thiab nws tsuas muaj READ-Tsuas Database Access.
Ib sab saum toj, dab tsi yog ntxig hloov tshiab rho tawm hauv SQL? Cov SQL INSERT , Hloov tshiab , thiab DELETE cov lus txib pab SQL ntawv cov neeg siv los tswj thiab hloov kho cov ntaub ntawv: Lub INSERT nqe lus qhia cov kab tshiab rau hauv ib lub rooj uas twb muaj lawm. Cov DELETE nqe lus tshem tawm ib kab lossis ua ke ntawm kab los ntawm lub rooj. Cov Hloov tshiab nqe lus enables cov neeg siv hloov tshiab ib kab lossis pawg kab hauv ib lub rooj.
Kuj paub, subqueries tuaj yeem siv rau hauv cov ntaub ntawv tshem tawm thiab / lossis hloov tshiab?
Subqueries feem ntau yog siv nrog SELECT nqe lus, txawm li cas los koj siv tau lawv hauv ib INSERT , Hloov tshiab , los yog DELETE nqe lus ib yam nkaus, lossis hauv lwm qhov subquery.
Dab tsi SQL nqe lus txib yog siv los ntxiv kab tshiab ntawm cov ntaub ntawv hauv ib lub rooj uas twb muaj lawm?
Cov INSERT INTO nqe lus ntawm SQL ntawv yog siv los ntxig ib kab tshiab hauv a rooj . Muaj ob txoj kev siv INSERT INTO nqe lus rau ntxig kab : Tsuas yog tus nqi : Thawj txoj kev yog qhia kom meej tsuas yog tus nqi ntawm cov ntaub ntawv yuav tsum tau muab tso rau yam tsis muaj kab npe.
Pom zoo:
Dab tsi yog cov lus nug siv los tso saib tag nrho cov npe ntawm cov ntxhuav hauv SQL Server?
Muaj ob txoj hauv kev los nrhiav txhua lub npe ntawm lub rooj, thawj qhov yog siv "QHOV" lo lus tseem ceeb thiab qhov thib ob yog los ntawm kev nug INFORMATION_SCHEMA
Yuav ua li cas koj tuaj yeem txav qhov taw tes nrawm nrawm mus rau qhov pib ntawm cov lus nug cov lus nug?
T lossis F: Nias Ctrl + txoj cai xub yuam sij kom txav qhov taw tes rau qhov pib ntawm lo lus tom ntej
Dab tsi yog qhov zaus ntawm kev tso tawm cov kev hloov tshiab loj rau S 4hana Cloud Edition?
S/4HANA on-premise version yog muaj txhua xyoo tso tawm loj kawg yog 1709 (hauv lub Cuaj Hli, 2017) thiab qhov txuas ntxiv tau npaj rau xyoo 1809 (Lub Cuaj Hli, 2018). Nyob rau hauv lub xyoo, SAP kuj tso tawm 2 FPS (Functional Pack Stacks) uas tsis muaj dab tsi tab sis rau down-porting qhov yooj yim los ntawm huab version mus rau hauv qhov chaw version
Dab tsi yog qhov txawv ntawm GraphQL kev hloov pauv thiab cov lus nug?
Hauv cov lus yooj yim cov lus nug yog SELECT nqe lus thiab kev hloov pauv yog INSERT Kev Ua Haujlwm. Cov lus nug hauv graphql yog siv los nqa cov ntaub ntawv thaum hloov pauv siv rau INSERT / HLOOV / DELETE ua haujlwm
Puas yog ib qho kev hloov pauv hloov tshiab ua rau muaj kev ua haujlwm tau hais tseg ntawm kev hloov tshiab?
Cov qauv tsis ua rau 'cov ntaub ntawv hloov tshiab,' thiab yog li feem ntau tsis tuaj yeem tua tsis tau dab tsi (ua rau, cov cai ua haujlwm, ntws, cov lus tawm, thiab lwm yam). Koj tuaj yeem xaiv kom rov ua haujlwm rov ua haujlwm cov cai thaum qhov hloov tshiab ua rau cov ntaub ntawv hloov pauv, tab sis kuv tsis paub meej tias yuav pab tau koj li cas