Datetimeoffset yog dab tsi hauv SQL?
Datetimeoffset yog dab tsi hauv SQL?

Video: Datetimeoffset yog dab tsi hauv SQL?

Video: Datetimeoffset yog dab tsi hauv SQL?
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Taw qhia rau DATETIMEOFFSET hom ntaub ntawv

Cov DATETIMEOFFSET tso cai rau koj los tswj txhua qhov taw tes hauv lub sijhawm, uas yog tus nqi hnub tim, nrog rau qhov offset uas qhia meej tias hnub tim txawv ntawm UTC ntau npaum li cas.

Tsis tas li ntawd, Datetimeoffset yog dab tsi?

Cov DateTimeOffset qauv suav nrog tus nqi DateTime, nrog rau cov cuab yeej Offset uas txhais qhov txawv ntawm qhov tam sim no DateTimeOffset Piv txwv hnub thiab sijhawm thiab Coordinated Universal Time (UTC).

Qhov thib ob, hom ntaub ntawv twg koj yuav siv uas yog lub sijhawm paub? Hnub tim cov ntaub ntawv hom yog HNUB, TIMESTAMP, TIMESTAMP nrog TIME ZONE , thiab TIMESTAMP nrog rau hauv zos TIME ZONE . Cov nqi ntawm hnub tim cov ntaub ntawv hom yog qee zaum hu ua datetimes.

Khaws qhov no hauv kev pom, SQL Switchoffset yog dab tsi?

Hauv SQL ntawv Server, ua SWITCHOFSET () muaj nuj nqi tuaj yeem siv los xa rov qab tus nqi hnub tim offset uas tau hloov pauv los ntawm qhov chaw khaws lub sijhawm offset mus rau lub sijhawm tshiab cheeb tsam offset. Hauv qab no yog cov piv txwv ntawm qhov haujlwm no ua haujlwm li cas.

SQL Server khaws cov sijhawm thaj tsam li cas?

SQL Server tso siab rau thaj tsam sijhawm uas yog khaws cia hauv Windows Registry. Sijhawm tsam ntsia rau hauv lub computer yog khaws cia hauv cov npe nram qab no: KEY_LOCAL_MACHINESOFTWAREMicrosoftWindows NTCurrentVersion Sijhawm Zones . Ib daim ntawv teev npe thaj tsam sijhawm kuj nthuav tawm los ntawm sys.

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