Video: Vim li cas kev kawm SQL tseem ceeb?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
SQL ntawv yog ib qho laj thawj tshwj xeeb programming lus uas yog siv los cuam tshuam nrog databases. Nws ua haujlwm los ntawm kev nkag siab thiab tshuaj xyuas cov ntaub ntawv uas suav nrog cov ntaub ntawv hauv lawv cov ntxhuav. Piv txwv li, peb tuaj yeem nqa ib lub koom haum loj uas muaj ntau cov ntaub ntawv yuav tsum tau khaws thiab tswj.
Yog li ntawd, kev kawm SQL tseem ceeb npaum li cas?
SQL ntawv tshwj xeeb tshaj yog zoo ntawm cov ntaub ntawv manipulation. Vim tias nws tso cai rau koj pom cov ntaub ntawv tseeb thiab nws ua haujlwm li cas, koj yuav muaj sijhawm yooj yim rau kev sim thiab tswj cov ntaub ntawv. Tsis tas li ntawd, cov ntaub ntawv khaws cia hauv SQL ntawv yog dynamic, txhais tau tias nws tuaj yeem hloov kho thiab kho txhua lub sijhawm siv qee cov lus nug yooj yim.
Tsis tas li ntawd, cov txiaj ntsig ntawm SQL yog dab tsi? Qhov zoo ntawm SQL
- Kev kub ceev. Siv cov lus nug SQL, tus neeg siv tuaj yeem khaws cov ntaub ntawv ntau ntawm cov ntaub ntawv sai thiab zoo.
- Tsis xav tau coding. Nyob rau hauv tus txheej txheem SQL, nws yooj yim heev los tswj cov txheej txheem database.
- Cov txheej txheem zoo.
- Portability.
- Cov lus sib tham.
- Ntau cov ntaub ntawv saib.
Yog li ntawd, SQL yog dab tsi thiab vim li cas nws thiaj li muaj txiaj ntsig?
SQL (Structured Query Language) yog tus qauv database hom lus uas siv los tsim, tswj thiab khaws cov ntaub ntawv sib raug zoo. Pib xyoo 1970, SQL tau dhau los ua ib qho tseem ceeb heev hauv cov ntaub ntawv kws tshawb fawb lub cuab yeej vim nws yog qhov tseem ceeb hauv kev nkag mus, hloov kho, ntxig, tswj thiab hloov kho cov ntaub ntawv.
Nws yuav siv sijhawm ntev npaum li cas los kawm SQL?
Ntev npaum li cas nws coj mus kawm SQL nyob ntawm koj lub computer programming tam sim no thiab raws nraim li cas ntau koj xav tau kawm . Yog tias koj twb muaj kev ua haujlwm hauv computer programming lossis koj muaj peev xwm hauv cheeb tsam no, kev kawm tus SQL pib ua tau coj tsawg li ob mus rau peb lub lis piam.
Pom zoo:
Vim li cas Piaget txoj kev xav ntawm kev paub txog kev loj hlob tseem ceeb?
Jean Piaget txoj kev xav ntawm kev paub txog kev loj hlob muab lub hauv paus rau kev nkag siab txog kev paub txog kev txawj ntse, lossis kev xav zoo li cas. Yog li muab sijhawm txaus rau cov menyuam yaus los cuam tshuam nrog ib puag ncig los ntawm tag nrho lawv cov kev xav ua rau lawv nkag siab zoo dua ntawm lub ntiaj teb nyob ib puag ncig lawv
Vim li cas nws tseem ceeb rau kev ntsuam xyuas cov peev txheej kev ntseeg tau?
Cov ntaub ntawv ntseeg tau, yog li ntawd, yuav tsum yog cov chaw ntseeg siab uas muab cov ntaub ntawv uas ib tus tuaj yeem ntseeg tias muaj tseeb. Nws yog ib qho tseem ceeb uas yuav tsum tau siv cov peev txheej uas ntseeg tau hauv cov ntaub ntawv tshawb fawb txog kev kawm vim tias koj cov neeg tuaj saib yuav xav kom koj tau rov qab koj cov lus pom zoo nrog cov pov thawj ntseeg tau
Vim li cas kev xav zoo yog qhov tseem ceeb hauv kev daws teeb meem?
Kev daws teeb meem thiab kev xav zoo yog hais txog kev muaj peev xwm siv kev paub, qhov tseeb, thiab cov ntaub ntawv los daws cov teeb meem zoo. Cov neeg ua haujlwm zoo tshaj plaws tuaj yeem xav zoo thiab muaj tswv yim, sib qhia kev xav thiab kev xav, siv kev txiav txim siab zoo, thiab txiav txim siab
Vim li cas nws tseem ceeb kom khaws cov ntaub ntawv tsis pub lwm tus paub hauv kev noj qab haus huv thiab kev saib xyuas kev noj qab haus huv?
Ib qho tseem ceeb tshaj plaws ntawm kev ceev ntiag tug yog tias nws pab tsim thiab txhim kho kev ntseeg siab. Nws muaj peev xwm tso cai rau cov ntaub ntawv pub dawb ntawm cov neeg siv khoom thiab cov neeg ua haujlwm thiab lees paub tias tus neeg siv khoom lub neej thiab txhua yam teeb meem thiab teeb meem uas lawv muaj rau lawv
Vim li cas yog vim li cas ib txoj hauv kev tseem ceeb ntawm kev paub?
Yog vim li cas thiaj paub. Yog vim li cas feem ntau suav hais tias tsis muaj nuj nqis los ntsuas seb qhov kev lees paub, lossis txawm tias tib neeg, puas ntseeg tau. Yog vim li cas qee zaum sib txawv nrog kev xav, qhov uas cov lus hais txog kev xav thiab kev xav zoo li yuav cuam tshuam peb txoj kev tshawb nrhiav kev paub; hloov peb ntawm 'qhov tseeb