Video: Koj rho tawm hauv SQL Server li cas?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Ntxiv (+), rho tawm (-), multiply(*), thiab faib(/). Lub npe ntawm lub rooj.
Cov neeg ua lej lej.
| Tus neeg ua haujlwm | Lub ntsiab lus | Ua haujlwm rau |
|---|---|---|
| - ( rho tawm ) | Kev rho tawm | Tus nqi |
| * (Multiply) | Multiplication | Tus nqi |
| / (Pib) | Kev faib | Tus nqi |
Tom qab ntawd, ib tus tuaj yeem nug, koj ua li cas hauv SQL?
Thaum koj xav tau ua kev suav hauv SQL nqe lus, koj siv tus lej lej. Kev qhia lej lej tuaj yeem muaj cov npe kab, cov lej lej, thiab tus lej lej.
| Tus neeg ua haujlwm | Kev piav qhia |
|---|---|
| + | Tus neeg teb xov tooj ntxiv |
| - | Tus neeg ua haujlwm rho tawm |
| * | Multiplication operator |
| / | Division tus neeg ua haujlwm |
Ib yam li ntawd, dab tsi tsuas yog cov lus nug rov qab? Lub SQL TSEEM CEEB clause/operator yog siv los ua ke ob Xaiv cov lus thiab rov qab los kab los ntawm thawj SELECT nqe lus uas tsis yog rov qab los los ntawm qhov thib ob SELECT nqe lus . Qhov no txhais tau tias TSUAS rov qab los tsuas yog kab, uas tsis muaj nyob rau hauv lub thib ob SELECT nqe lus.
Qhov sib thooj, suav (*) ua dab tsi hauv SQL?
COUNT(*) xa rov qab tus naj npawb ntawm kab hauv ib lub rooj teev, thiab nws khaws cov kab sib npaug. Nws suav txhua kab sib cais. Qhov no suav nrog cov kab uas muaj cov nqi null.
Koj puas tuaj yeem rho tawm hauv SQL?
SQL ntawv | MINUS Tus neeg ua haujlwm. Cov rho tawm Operator hauv SQL ntawv yog siv nrog ob nqe lus SELECT. Cov MINUS tus neeg teb xov tooj yog siv rau rho tawm qhov tshwm sim tau los ntawm thawj SELECT query los ntawm qhov tshwm sim tau los ntawm qhov thib ob SELECT query.
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