Puas yog nyob nruab nrab ntawm Oracle?
Puas yog nyob nruab nrab ntawm Oracle?

Video: Puas yog nyob nruab nrab ntawm Oracle?

Video: Puas yog nyob nruab nrab ntawm Oracle?
Video: Niam xa me tub mus kawm nthawv # 2. 9/12/2017 2024, Kaum ib hlis
Anonim

Cov Oracle BETWEEN xwm txheej yuav xa rov qab cov ntaub ntawv uas qhia nyob rau hauv ntau yam ntawm value1 thiab value2 ( suav nrog ).

Raws li, yog ntawm tus neeg teb xov tooj suav nrog hauv SQL?

Cov SQL BETWEEN Operator Cov BETWEEN tus neeg teb xov tooj xaiv qhov muaj nuj nqis nyob rau hauv ib thaj tsam. Cov txiaj ntsig tuaj yeem yog tus lej, ntawv nyeem, lossis hnub. Cov BETWEEN tus neeg teb xov tooj yog suav nrog : pib thiab xaus qhov tseem ceeb suav nrog.

Tom qab, lo lus nug yog, lub hom phiaj ntawm SQL clause yog dab tsi? Cov SQL BETWEEN qhov xwm txheej tso cai rau koj sim yooj yim yog tias ib qho kev qhia nyob hauv ntau qhov tseem ceeb (nrog rau). Nws tuaj yeem siv tau hauv SELECT, INSERT, UPDATE, lossis DELETE nqe lus.

Ib tug kuj yuav nug, ua li cas ntawm kev ua haujlwm hauv Oracle?

Cov NTAU tus neeg teb xov tooj tso cai rau koj los txheeb xyuas qhov ntau yam los kuaj. Thaum koj siv lub NTAU tus neeg teb xov tooj los tsim ib qho kev tshawb nrhiav rau kab rov qab los ntawm SELECT nqe lus, tsuas yog kab uas nws muaj nuj nqis yog nyob rau hauv qhov ntau yam yog rov qab los. Qhov qis thiab siab qhia qhov qis thiab sab sauv qhov tseem ceeb ntawm qhov ntau los kuaj.

Kuv yuav siv li cas ntawm cov xwm txheej hauv SQL?

Ob qho tib si ntawm cov neeg ua haujlwm no yog siv los tshawb pom ntau qhov txiaj ntsig ntawm lub rooj. Qhov txawv nruab nrab cov no tus neeg ua haujlwm yog tus BETWEEN tus neeg teb xov tooj yog siv los xaiv ntau yam ntaub ntawv nruab nrab ob qhov tseem ceeb thaum Lub IN tus neeg ua haujlwm tso cai rau koj qhia ntau yam nqi.

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