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Video: Nrhiav kev sib raug zoo hauv Salesforce yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Salesforce - Nrhiav kev sib raug zoo . Kev tshaj tawm. A Nrhiav kev sib raug zoo suav nrog nrhiav tus nqi ntawm daim teb raws li tus nqi hauv lwm daim teb hauv lwm yam khoom. Nws feem ntau yog siv nyob rau hauv cov ntaub ntawv ntawm feem ntau sib koom cov ntaub ntawv ntawm ob yam khoom.
Thiab cov lus nug yog, dab tsi yog qhov sib txawv ntawm kev sib raug zoo hauv Salesforce?
Salesforce muab cov kev sib raug zoo hauv qab no uas tuaj yeem tsim los ntawm cov khoom:
- Master-detail kev sib raug zoo.
- Nrhiav kev sib raug zoo.
- Kev sib raug zoo ntawm tus kheej.
- Sab nrauv nrhiav kev sib raug zoo.
- Indirect nrhiav kev sib raug zoo.
- Ntau-rau-ntau txoj kev sib txuas (kev sib txuas khoom)
- Hierarchical kev sib raug zoo.
Tsis tas li ntawd, muaj pes tsawg Lookup kev sib raug zoo nyob hauv Salesforce? Txhua yam khoom raug tso cai kom muaj ib lossis ob tus tswv, lossis txog li 8 cov ntsiab lus. Koj tuaj yeem muaj tag nrho ntawm 40 Kev sib raug zoo teb nrog qhov siab kawg ntawm 2 Master Detail Kev Sib Raug Zoo. Yog li koj tuaj yeem muaj txhua yam 40 raws li Lookup Relationship fields, 38 Lookup and 2 MD 39 Nrhiav thiab 1 MD kev sib raug zoo teb ntawm ib yam khoom.
Ntawm no, qhov sib txawv ntawm kev saib thiab kev nthuav dav kev sib raug zoo hauv Salesforce yog dab tsi?
Thaum nrhiav kev sib raug zoo zoo li casual, tus tswv - nthuav dav kev sib raug zoo yog me ntsis nruj. Hauv hom no kev sib raug zoo , ib yam khoom yog lub tus tswv thiab lwm qhov yog nthuav dav . Cov tus tswv khoom tswj tej yam cwj pwm ntawm cov nthuav dav khoom, zoo li leej twg tuaj yeem saib cov nthuav dav cov ntaub ntawv.
Txoj kev nrhiav kev sib raug zoo yog dab tsi?
A Nrhiav kev sib raug zoo suav nrog nrhiav tus nqi ntawm ib daim teb raws li tus nqi hauv lwm daim teb hauv lwm yam khoom. Nws feem ntau yog siv nyob rau hauv cov ntaub ntawv ntawm feem ntau sib koom cov ntaub ntawv ntawm ob yam khoom.
Pom zoo:
Vim li cas kev sib raug zoo algebra siv nyob rau hauv kev sib raug zoo database tswj?
RELATIONAL ALGEBRA yog ib hom lus nug uas siv dav heev. Nws sau cov xwm txheej ntawm kev sib raug zoo raws li kev tawm tswv yim thiab muab qhov tshwm sim ntawm kev sib raug zoo raws li cov zis. Nws siv ntau yam haujlwm los ua qhov haujlwm no. Relational algebra operations yog ua recursively ntawm kev sib raug zoo
Dab tsi yog kev sib tshuam hauv kev sib raug zoo algebra?
INTERSECTION kev khiav hauj lwm nyob rau hauv RELATIONAL ALGEBRA. Kev sib tshuam ntawm teeb A thiab B = A ∩ B = {1, 6} Cov ntsiab lus uas muaj nyob rau hauv ob qho tib si A thiab B yuav tsuas muaj nyob rau hauv lub teeb tau los ntawm kev sib tshuam ntawm A thiab B
Dab tsi yog qhov txawv ntawm kev sib raug zoo unary kev sib raug zoo binary thiab kev sib raug zoo ternary?
Kev sib raug zoo tsis sib xws yog thaum ob tus neeg koom hauv kev sib raug zoo yog tib lub koom haum. Piv txwv li: Cov ncauj lus yuav yog qhov yuav tsum tau ua ua ntej rau lwm yam kev kawm. Kev sib raug zoo ternary yog thaum peb lub koom haum koom nrog kev sib raug zoo
Dab tsi yog qhov txawv ntawm kev sib raug zoo thiab tsis muaj kev sib raug zoo databases?
Qhov sib txawv loj ntawm lawv yog li cas lawv tuav cov ntaub ntawv. Relational databases are structured.Non-relational databases are document-oriented. Qhov no hu ua cov ntaub ntawv hom cia tso cai ntau 'qeb' ntawm cov ntaub ntawv khaws cia hauv ib qho kev tsim lossis Cov Ntaub Ntawv
Dab tsi yog qee qhov tsis zoo ntawm lub sijhawm stamping txoj hauv kev rau kev tswj hwm kev sib raug zoo?
Qhov tsis zoo ntawm lub sij hawm stamping mus kom ze yog tias txhua tus nqi khaws cia hauv cov ntaub ntawv yuav tsum muaj ob lub sij hawm thwj ntxiv: ib qho rau lub sijhawm kawg ntawm daim teb tau nyeem thiab ib qho rau qhov hloov tshiab kawg. Lub sij hawm stamping yog li ua rau kom nco xav tau thiab cov ntaub ntawv ua haujlwm nyiaj siv ua haujlwm