Video: Dab tsi yog kab sampling hauv SSIS?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Kab Sampling Kev hloov pauv hauv SSIS muab kev xaiv los qhia tus naj npawb ntawm kab koj xav retrieve los ntawm cov ntaub ntawv qhov chaw. Kab Sampling Kev hloov pauv hauv SSIS yuav coj tag nrho cov ntaub ntawv los ntawm ib qhov chaw, thiab nws randomly rho tawm tus naj npawb ntawm xaiv kab.
Ib yam li ntawd, koj tuaj yeem nug, qhov piv txwv feem pua ntawm SSIS yog dab tsi?
Feem ntau, cov Qhov feem pua sampling kev hloov pauv hauv SSIS yog rau kev tsim cov ntaub ntawv. Qhov no SSIS feem pua Sampling transformation xaiv ib tug muab feem pua ntawm kab los ntawm cov ntaub ntawv qhov chaw. Qhov txawv tsuas yog, Feem pua Sampling xaiv cov feem pua ntawm kab ntau dua li cov kab (Row Qauv ).
Tsis tas li ntawd, kev hloov pauv hauv SSIS yog dab tsi? Cov Sort Transformation in SSIS yog siv rau xaiv cov ntaub ntawv los ntawm Ascending lossis Descending Order, uas zoo ib yam li T-SQL hais kom ua BY nqe lus. Ib txhia kev hloov pauv zoo li Merge Kev hloov pauv thiab Merge Join Kev hloov pauv xav tau cov ntaub ntawv xaiv ua ntej siv lawv.
Hauv qhov no, lookup txawv ntawm Lookup transformation li cas?
Lub sij hawm Lookup muab ob kab ntawv tso zis ntxiv: Lub sij hawm (cov lub sij hawm los ntawm saib table) thiab zaus (tus naj npawb ntawm lub sij hawm lub lub sij hawm nyob rau hauv cov ntaub ntawv siv tshwm sim nyob rau hauv cov ntaub ntawv input teeb). Ntxiv rau: Cov Lub sij hawm Lookup transformation tsuas tuaj yeem siv kab ke uas muaj DT_WSTR lossis DT_NTEXT cov ntaub ntawv hom.
Dab tsi yog kev sib cais hauv SSIS?
SSIS Basics: Siv cov Conditional Split . Cov Conditional Split tuaj yeem xa cov ntaub ntawv kab mus rau cov txiaj ntsig sib txawv nyob ntawm seb qhov xwm txheej twg ntawm cov ntaub ntawv koj xav tau. Kev hloov pauv cia koj xa koj cov ntaub ntawv ntws mus rau qhov sib txawv, raws li cov txheej txheem teev tseg hauv kev hloov pauv tus editor.
Pom zoo:
Dab tsi yog qhov txawv ntawm tus kab mob los ntawm tus kab mob?
Qhov sib txawv tseem ceeb ntawm tus kab mob thiab tus kab mob yog cov kab mob yuav tsum tau tshwm sim los ntawm kev ua kom lawv tus tswv tsev; whereas worms yog stand-alone siab phem cov kev pab cuam uas muaj peev xwm nws tus kheej-replicate thiab propagate nws tus kheej sai li sai tau raws li lawv tau ua txhaum lub system
Koj qhia li cas yog kab laum yog kab kab?
Tej yam zoo li lub tis thiab kav hlau txais xov tuaj yeem pab koj txheeb xyuas tus kab mob li kab laum. Koj yuav tsum tau saib cov cim qhia ntawm kev kis kab mob, xws li cov av nkos thiab cov xau. Saib cov tis thiab kav hlau txais xov. Termites muaj 4 tis. Nco ntsoov tias termites poob lawv cov tis tom qab swarming, yog li cov termite koj tab tom saib yuav tsis muaj
Dab tsi yog ib kab lus noun hauv kab lus?
Cov kab lus noun suav nrog lub npe-tus neeg, qhov chaw, lossis yam khoom-thiab cov kev hloov pauv uas paub qhov txawv. Cov kev hloov pauv tuaj yeem ua ntej lossis tom qab lub npe. Cov uas tuaj ua ntej yuav suav nrog cov ntawv, cov npe muaj npe, cov lus muaj npe, cov npe, thiab / lossis cov koom nrog
Dab tsi yog kab hauv thiab kab tawm?
Cov khoom siv hluav taws xob siv hluav taws xob cuam tshuam nrog lub suab (piv txwv li daim npav suab) feem ntau muaj cov kab txuas sau npe hauv thiab / lossis kab tawm. Kab tawm muab lub suab signaloutput thiab kab hauv tau txais ib lub signalinput
Kab thiab kab hu ua dab tsi hauv DBMS?
Hauv computer science terminology, kab qee zaum hu ua 'tuples,' kab yuav raug hu ua 'tus cwj pwm,' thiab cov ntxhuav lawv tus kheej yuav raug hu ua 'kev sib raug zoo'. Ib lub rooj tuaj yeem pom tau raws li qhov matrix ntawm kab thiab kab, qhov twg txhua qhov kev sib tshuam ntawm kab thiab kab muaj cov nqi tshwj xeeb