Dab tsi yog subdate hauv sql?

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Dab tsi yog subdate hauv sql?
Dab tsi yog subdate hauv sql?

Video: Dab tsi yog subdate hauv sql?

Video: Dab tsi yog subdate hauv sql?
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Lub SUBDATE muaj nuj nqi rho tawm lub sijhawm / hnub ncua ntawm hnub thiab rov qab hnub.

Dab tsi yog Subdate?

SUBDATE muaj nuj nqi hauv MySQL yog siv los rho tawm lub sijhawm tus nqi (raws li ntu) los ntawm hnub muab. … expr: Tus nqi ntawm lub sij hawm/hnub lub sij hawm rau rho tawm. unit: Hom ncua sij hawm.

Date_sub yog dab tsi hauv MySQL?

DATE_SUB muaj nuj nqi hauv MySQL yog siv los rho tawm lub sijhawm lossis hnub tim rau lub sijhawm teev tseg thiab tom qab ntawd rov qab hnub. … Thiab ntawm no tus addunit yog hom ncua sij hawm rho tawm xws li SECOND, MINUTE, HOUR, HNUB, XYOO, HNUB thiab lwm yam.

Lub sijhawm nyob hauv MySQL yog dab tsi?

MySQL ncua sij hawm yog tus neeg teb xov tooj, uas yog raws li kev tshawb nrhiav binary los tshawb nrhiav cov khoom thiab xa rov qab tus nqi ntawm 0 rau N. Nws yog tsuas yog siv los xam cov hnub thiab lub sij hawm tus nqi. Peb tuaj yeem siv cov syntax hauv qab no los tsim tus nqi luv: INTERVAL expr unit.

Timestampdiff yog dab tsi hauv MySQL?

TIMESTAMPDIFF:

Qhov haujlwm no hauv MySQL yog siv rov qab tus nqi tom qab rho tawm DateTime qhia los ntawm lwm qhov.

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