Video: Puas yog SQL Server muaj cov kab ke?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Hauv SQL Server , koj ua tau tsim ib qho autonumber teb los ntawm kev siv ua ntu zus . A sequence yog ib yam khoom hauv SQL Server (Kev lag luam- SQL ntawv ) uas yog siv los tsim tus lej ib ntus . Qhov no ua tau yuav pab tau thaum koj xav tau los tsim tus lej tshwj xeeb los ua tus yuam sij tseem ceeb.
Ib yam li ntawd, koj tuaj yeem nug, SQL Server sequences yog dab tsi?
Hauv SQL Server , a ib ntus yog ib tug neeg siv-txhais schema-bound khoom uas generates a ib ntus ntawm cov lej raws li qhov kev qhia tshwj xeeb. A ib ntus ntawm tus lej muaj nuj nqis tuaj yeem ua rau nce lossis nqis los ntawm lub sijhawm tau hais tseg thiab tuaj yeem mus ncig yog tias thov.
Tom qab ntawd, lo lus nug yog, dab tsi yog qhov tseeb ntawm cov kab ke hauv SQL? Ib ntus yog ib pawg ntawm cov lej 1, 2, 3, … uas tau tsim thiab txhawb nqa los ntawm qee cov txheej txheem database los tsim cov txiaj ntsig tshwj xeeb ntawm kev thov. Ib ntus nquag siv nyob rau hauv ntau databases vim hais tias ntau daim ntawv thov yuav tsum tau txhua kab nyob rau hauv ib lub rooj kom muaj ib tug tshwj xeeb tus nqi thiab ua ntu zus muab txoj hauv kev yooj yim los tsim lawv.
Tsis tas li lo lus nug yog, koj ua li cas thiaj li ua tiav hauv SQL?
Tsim ib Ib ntus Syntax los tsim ib ib ntus yog, CREATE SEQUENCE ib ntus -npe PIB Nrog thawj-tus nqi nce los ntawm increment-tus nqi MAXVALUE siab tshaj-tus nqi CYCLE | NCO TSEG; Thawj-tus nqi qhia tus nqi pib rau qhov Ib ntus . Qhov increment-value yog tus nqi uas ib ntus yuav incremented.
Dab tsi yog qhov txawv ntawm ntu thiab tus kheej hauv SQL Server?
Cov Tus kheej khoom yog ib kem khoom txhais tau tias nws yog khi rau lub rooj, whereas lub ib ntus yog tus neeg siv-txhais cov khoom siv database thiab nws tsis khi rau ib lub rooj tshwj xeeb uas txhais tau tias nws tus nqi tuaj yeem sib koom los ntawm ntau lub rooj.
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