Video: Koj puas tuaj yeem siv cov lus qhia tsis tu ncua hauv SQL?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Tsis zoo li MySQL thiab Oracle, SQL ntawv Server database ua tsis txhawb built-in RegEx muaj nuj nqi. Txawm li cas los xij, SQL ntawv Server muaj built-in functions los daws cov teeb meem nyuaj. Piv txwv ntawm cov haujlwm no yog LIKE, PATINDEX, CHARINDEX, SUBSTRING thiab REPLACE.
Ntawm no, dab tsi yog * hauv kev qhia tsis tu ncua?
* hauv lub ntiaj teb sib piv txhais tau tias "xoom lossis ntau dua ntawm ib tus cwj pwm", sau ua. *in ib kev qhia tsis tu ncua . Cov. dot cim tsis muaj lub ntsiab lus tshwj xeeb hauv lub ntiaj teb sib txuam: nws tsuas yog sawv rau nws tus kheej xwb.
Qhov thib ob, siv li cas muaj nyob rau hauv SQL? Muaj yog ib tug predicate siv nyob rau hauv qhov chaw ntawm ib tug Transact- SQL ntawv SELECT nqe lus los ua SQL ntawv Server full-text search on full-text indexed columns muaj hom ntaub ntawv raws tus cwj pwm. Muaj tuaj yeem tshawb rau: Ib lo lus lossis kab lus. Lub prefix ntawm ib lo lus los yog kab lus.
Ib yam li ntawd, cov lus hais li cas hauv Oracle?
Cov lus qhia tsis tu ncua pab kom koj tshawb nrhiav cov qauv hauv cov ntaub ntawv hlua los ntawm kev siv cov qauv kev sib txuas lus sib txuas. Koj teev a kev qhia tsis tu ncua los ntawm kev siv cov cim hauv qab no: Metacharacters, uas yog cov neeg ua haujlwm uas qhia txog kev tshawb nrhiav algorithms. Literals, uas yog cov cim uas koj yog
Dab tsi tsis zoo li SQL?
Cov TSIS ZOO tus neeg ua haujlwm hauv SQL ntawv yog siv rau ntawm kab uas yog hom varchar. Feem ntau, nws yog siv nrog % uas yog siv los sawv cev rau txhua txoj hlua tus nqi, suav nrog tus cwj pwm null. Txoj hlua peb hla mus rau tus neeg teb xov tooj no yog tsis yog case-sensitive.
Pom zoo:
Thaum koj reboot koj lub kaw lus lub computer ua raws li pib cov lus qhia khaws cia rau hauv hom kev nco Pawg ntawm cov lus teb xaiv?
Teb Cov Kws Tshaj Lij Tshaj Lij Tshaj Tawm Ib lub khoos phis tawj pib cov lus qhia tau muab khaws cia rau hauv hom nco hu ua Flash. Flash nco tuaj yeem sau rau thiab nyeem los ntawm, tab sis nws cov ntsiab lus tsis raug tshem tawm tom qab lub khoos phis tawj kaw. Lub cim xeeb Flash no feem ntau hu ua BIOS (Basic Input Output System)
Koj puas tuaj yeem qhia Outlook daim ntawv qhia hnub yam tsis muaj Exchange?
Qhia tawm Outlook daim ntawv qhia hnub yam tsis muaj Exchange. Sync2Cloud tso cai sib koom Outlook daim ntawv qhia hnub yam tsis muaj MicrosoftExchange. Nws tso cai rau kev sib koom ua ke ntawm koj daim ntawv qhia hnub (iCloud, Google lossis Office 365). Saib thiab tswj qhov lees txais kev qhia Calendar ntawm ib qho khoom siv oraccount
Peb puas tuaj yeem siv cov lus npaj rau xaiv cov lus nug hauv Java?
Yuav siv cov lus npaj li cas rau xaiv cov lus nug hauv Java nrog MySQL? Tam sim no koj tuaj yeem tso saib tag nrho cov ntaub ntawv ntawm lub rooj siv Java PreparedStatement. Koj yuav tsum siv txoj kev executeQuery()
Nws puas tuaj yeem tsim cov kev hloov pauv thoob ntiaj teb lossis qhov tsis tu ncua hauv kev ua haujlwm alteryx?
Raws li cov nplooj ntawv pab Alteryx: 'Cov ntaub ntawv tsis tu ncua yog cov hloov pauv thoob ntiaj teb rau kev ua haujlwm. Constants ua rau nws muaj peev xwm hloov tus nqi hauv ib qho chaw thiab muaj qhov hloov pauv mus rau lwm qhov ntawm cov haujlwm.' Lub checkbox 'Yog Numeric' ntawm sab xis sab xis yuav ua tus nqi tus lej ntau dua li txoj hlua
Cov cuab yeej twg koj tuaj yeem siv los tshawb pom qhov tsis zoo lossis kev teeb tsa tsis zoo ntawm koj lub khoos phis tawj thiab lub network?
Lub tshuab ntsuas qhov tsis zoo yog ib qho cuab yeej uas yuav tshuaj xyuas lub network thiab cov tshuab nrhiav qhov tsis zoo lossis cov teeb tsa tsis raug uas sawv cev rau kev pheej hmoo nyab xeeb