Video: Kev siv Openquery hauv SQL Server yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Cov OPENQUERY command yog siv los pib ib qho ad-hoc cov lus nug uas siv qhov txuas- server . Nws yog pib los ntawm kev qhia OPENQUERY raws li lub rooj lub npe nyob rau hauv nqe lus. Qhov tseem ceeb, nws qhib qhov txuas server , ces executes ib query li yog executing los ntawm qhov ntawd server.
Tsuas yog li ntawd, yog Openquery sai dua?
OPENQUERY xav tau ib tus neeg rau zaub mov txuas, yog li nws tsis tau txais sai dua . Kev hloov cov ntaub ntawv tiag tiag yuav yog los ntawm tib lub chaw muab kev pabcuam thiab network. Tab sis feem ntau nws tuaj yeem siv los txwv cov ntaub ntawv uas yuav tsum tau xa tawm hauv lub network, lossis tiv thaiv cov lus nug optimizer los ntawm kev xaiv cov phiaj xwm phem.
Tom qab, lo lus nug yog, Openrowset SQL Server yog dab tsi? OPENROWSET yog lwm txoj hauv kev txuas servers . Los ntawm kev siv lub OPENROWSET muaj nuj nqi peb tuaj yeem khaws cov ntaub ntawv los ntawm txhua qhov chaw cov ntaub ntawv uas txhawb nqa OLEDB tus kws kho mob sau npe, xws li cov chaw taws teeb ntawm SQL Server , Microsoft Access, Excel file, Text file, lossis CSV cov ntaub ntawv.
Ib sab saum toj no, Dblink yog dab tsi hauv SQL Server?
A database link yog ib qho khoom siv schema hauv ib lub database uas tso cai rau koj nkag mus rau cov khoom ntawm lwm lub database. Hauv SQL ntawv cov nqe lus, koj tuaj yeem xa mus rau lub rooj lossis saib ntawm lwm cov ntaub ntawv los ntawm kev ntxiv @ dblink ua mus rau lub rooj los yog saib lub npe. Koj tuaj yeem nug ib lub rooj lossis saib ntawm lwm cov ntaub ntawv nrog SELECT nqe lus.
Openquery yog dab tsi?
Cov OPENQUERY hais kom ua yog siv los pib qhov ad-hoc cov lus nug uas tau siv los ntawm kev sib txuas-server. Nws yog pib los ntawm kev qhia OPENQUERY raws li lub rooj lub npe nyob rau hauv nqe lus. Qhov tseem ceeb, nws qhib lub server txuas, tom qab ntawd ua cov lus nug zoo li ua tiav los ntawm tus neeg rau zaub mov ntawd.
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