Video: Puas yog suav nrog hauv MySQL?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Cov MySQL BETWEEN tus neeg teb xov tooj yog suav nrog . Piv txwv li, thaum koj siv lub MySQL BETWEEN tus neeg teb xov tooj kom khaws cov phau ntawv uas nws tus nqi nyob hauv qhov ntau nruab nrab 50 thiab 90, qhov tshwm sim tau khaws tag nrho cov phau ntawv no, suav nrog cov nqi sib npaug 50 lossis 90.
Tib neeg kuj nug, ua li cas ntawm kev ua haujlwm hauv MySQL?
Cov MYSQL BETWEEN xwm txheej qhia txog yuav ua li cas thiaj li tau txais txiaj ntsig los ntawm kev qhia hauv ib qho tshwj xeeb. Nws yog siv nrog SELECT, INSERT, UPDATE thiab DELETE nqe lus.
(i) MySQL BETWEEN cov xwm txheej nrog tus lej lej:
- SELECT *
- Los ntawm cov tub ceev xwm.
- THAUM officer_id BETWEEN 1 THIAB 3;
Tsis tas li, vim li cas ntawm tus neeg teb xov tooj siv? Cov BETWEEN tus neeg teb xov tooj yog ib qho laj thawj tus neeg ua haujlwm uas tso cai rau koj los txheeb xyuas seb tus nqi hauv qhov ntau lossis tsis. Cov BETWEEN tus neeg teb xov tooj feem ntau yog siv nyob rau hauv QHOV CHAW UA HAUJ LWM ntawm SELECT, UPDATE, thiab DELETE cov lus. Yog hais tias ib qho kev nthuav qhia yog NULL, lub BETWEEN tus neeg teb xov tooj rov NULL.
Kuj kom paub yog, puas yog nruab nrab ntawm qhov kawg ntawm MySQL?
MySQL BETWEEN tsis muaj cov ntsiab lus kawg . MySQL's BETWEEN suav nrog tag nrho cov txiaj ntsig nruab nrab ob cov ntsiab lus kawg zoo li cov cov ntsiab lus kawg.
Dab tsi yog qhov kev txiav txim ua ntej los ntawm hauv SQL?
Cov TSIS TAU BY nqe lus hauv sql ua yog siv rau xaiv cov ntaub ntawv khaws cia nyob rau hauv ib qho nce los yog nqis raws li ib lossis ntau kab. Los ntawm default ORDER Los ntawm txheeb cov ntaub ntawv nyob rau hauv ascending xaj . Peb tuaj yeem siv lo lus tseem ceeb DESC rau xaiv cov ntaub ntawv hauv descending xaj thiab lo lus tseem ceeb ASC rau xaiv hauv ascending xaj.
Pom zoo:
Lub tsev Roman tseem ceeb thiab zoo li cas suav nrog tag nrho cov hauv qab no nta lub thoob khib nyiab hauv pliaj vaults thiab lub hauv paus dome hla ib chav tsev yim sab?
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