Video: Kev sib sau txhais li cas hauv kev tshawb fawb?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Txhais thiab hom Aggregates
Aggregates yog tsim los ntawm kev sib txuas cov ntaub ntawv los ntawm ntau qhov chaw. Thaum koj tag nrho cov ntaub ntawv, koj siv ib lossis ntau qhov kev txheeb cais, xws li a txhais tau tias , nruab nrab, lossis hom, muab cov lus piav qhia yooj yim thiab nrawm ntawm qee qhov tshwm sim ntawm kev txaus siab
Tom qab ntawd, nws txhais li cas los sau cov ntaub ntawv?
Cov ntaub ntawv sib sau yog hais txog tus lej lossis cov ntaub ntawv tsis yog tus lej uas yog (1) sau los ntawm ntau qhov chaw thiab/lossis ntawm ntau yam kev ntsuas, hloov pauv, lossis tus neeg thiab (2) muab tso ua ke rau hauv cov ntaub ntawv Cov ntsiab lus los yog cov lus qhia luv luv, feem ntau yog rau lub hom phiaj ntawm kev tshaj tawm pej xeem lossis kev txheeb xyuas txheeb cais-i.e., tshuaj xyuas cov ncauj lus, Ib tug kuj yuav nug, dab tsi yog ib qho piv txwv ntawm kev sib sau? Ib tag nrho yog ib qho sau los ntawm cov neeg uas tshwm sim nyob rau tib qhov chaw tib lub sijhawm tab sis tsis muaj kev sib txuas rau ib leeg. Piv txwv : Cov neeg sib sau ua ke hauv tsev noj mov nyob rau yav tsaus ntuj yog ib qho piv txwv ntawm aggregate , tsis yog ib pab.
Ib yam li ntawd, cov kev tshawb fawb aggregate yog dab tsi?
Ua ke (Ecologic) Kev kawm Hauv tag nrho (tseem hu ua ecologic) kev kawm muaj kev sib piv ntawm cov pab pawg, tab sis kev nthuav tawm tsis tau txiav txim siab ntawm tus kheej. Qhov no yog ib qho kev tshawb fawb tsim rau cov tshuaj lom kev kawm . Ib qho piv txwv yog kev kawm txog cov dej phwj tuaj ntawm cov tshuaj hormones hauv cov ntses.
Dab tsi yog txhais los ntawm aggregate muaj nuj nqi?
Aggregate functions hauv SQL. Hauv kev tswj hwm database ib aggregate muaj nuj nqi yog a muaj nuj nqi qhov twg qhov tseem ceeb ntawm ntau kab yog pawg ua ke raws li cov tswv yim ntawm qee cov txheej txheem los tsim ib tus nqi ntawm qhov tseem ceeb dua lub ntsiab lus.
Pom zoo:
Puas yog kev tshawb nrhiav linear zoo ib yam li kev tshawb fawb sib txuas?
Chav Kawm: Nrhiav algorithm
Dab tsi yog cov tshuab tshawb nrhiav uas tshawb nrhiav lwm lub tshuab tshawb fawb?
Txhawm rau pib tawm ntawm peb txoj kev tshawb nrhiav taug txuj kev nyuaj, cia saib qee qhov kev tshawb fawb dav dav tshaj qhov peb sab saum toj. DuckDuckGo. Kev txhawj xeeb txog kev ceev ntiag tug hauv online? Nrhiav Encrypt. Nrhiav rau lwm txoj rau DuckDuckGo? Ecosia. Xav tau tsob ntoo cog thaum koj tshawb nrhiav? Dogpile. Blekko. WolframAlpha. Gigablast. Facebook Nrhiav
Dab tsi yog kev sau cov ntaub ntawv hauv kev tshawb fawb?
Lub hom phiaj ntawm kev sib sau cov ntaub ntawv yog los txhawb txoj kev npaj ntawm koj lub koom haum txoj haujlwm kom ua tiav tag nrho. Nws yog ib qho tseem ceeb los saib cov ntaub ntawv muaj tseeb - cov ntaub ntawv lub hom phiaj, suav nrog cov pej xeem thiab cov kev coj ua zoo tshaj plaws
Dab tsi yog kev sib tham kev txheeb xyuas hauv kev tshawb fawb?
Kev txheeb xyuas kev sib tham yog ib txoj hauv kev rau kev kawm txog kev sib raug zoo ntawm kev sib raug zoo thiab kev sib tham hauv kev sib tham uas, txawm hais tias muaj hauv paus hauv kev kawm txog kev noj qab haus huv ntawm lub neej niaj hnub, tau ua rau muaj kev cuam tshuam tseem ceeb thoob plaws tib neeg thiab kev sib raug zoo nrog rau kev hais lus
Dab tsi yog qhov zoo ntawm kev tshawb fawb zoo tshaj li kev tshawb fawb ntau?
Cov ntaub ntawv los ntawm kev tshawb fawb ntau - xws li kev lag luam loj, pej xeem, thiab cov neeg siv nyiam - muab cov ntaub ntawv tseem ceeb rau kev txiav txim siab ua lag luam. Kev tshawb fawb zoo muab cov ntaub ntawv tseem ceeb rau kev siv hauv kev tsim cov khoom lag luam-nrog rau cov ntaub ntawv hais txog cov neeg siv khoom xav tau, tus qauv coj tus cwj pwm, thiab cov ntaub ntawv siv