Cov txheej txheem:
Video: Kuv yuav ntxiv cov teev rau hnub tim hauv SQL li cas?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2024-01-18 08:24
Yuav siv li cas DATEADD() Muaj nuj nqi thiab piv txwv
- Ntxiv 30 hnub rau a hnub tim SELECT DATEADD (DJ, 30, @ Hnub tim )
- Ntxiv 3 teev mus rau hnub SELECT DATEADD ( HOS , -3, @ Hnub tim )
- Tshem tawm 90 feeb los ntawm hnub tim SELECT DATEADD (MIB, -90, @ Hnub tim )
- Mus saib daim ntawv qhia kom tau ib daim ntawv teev tag nrho cov kev xaiv.
Tom qab ntawd, ib tus tuaj yeem nug, Kuv yuav ntxiv xyoo rau hnub hauv SQL li cas?
SQL Server DATEADD() Muaj nuj nqi
- Ntxiv ib xyoos rau ib hnub, ces rov qab hnub: SELECT DATEADD(xyoo, 1, '2017/08/25') AS DateAdd;
- Ntxiv ob lub hlis rau ib hnub, ces rov qab hnub:
- Tshem tawm ob lub hlis ntawm ib hnub, tom qab ntawd rov qab hnub:
- Ntxiv 18 xyoo rau hnub tim hauv kab Hnub Yug, tom qab ntawd rov qab hnub:
Ib tug kuj nug, koj puas tuaj yeem rho tawm hnub hauv SQL? Yuav ua li cas rho tawm hnub hauv SQL Server – Querychat. SQL ntawv Server tsis txhawb tus neeg teb xov tooj rho tawm tab sis muaj cov npe ntev ntawm cov haujlwm uas tso cai rau peb ua haujlwm nrog hnub hom teb xws li DATEADD, DATEDIFF, DATENAME, DATEPART, HNUB, GETDATE, MONTH, YEAR, thiab lwm yam.
Raws li txoj cai, kuv yuav ua li cas thiaj li tau txais lub hli los ntawm hnub hauv SQL?
Lub logic yog yooj yim heev. Cov ua ntej ntu @ DATE -HNUB(@ DATE ) tau tshwm sim rau hnub kawg ntawm yav dhau los hli thiab ntxiv 1 rau nws yuav ua rau tus ua ntej hnub tam sim no hli . Qhov thib ob EOMONTH(@ DATE ) ua rau siv SYSTEM muaj nuj nqi EOMONTH uas tshwm sim rau hnub kawg ntawm qhov muab hnub.
SQL xam hnub tim li cas?
Cov DATEDIFF () muaj nuj nqi xa rov qab qhov yuam kev yog tias qhov tshwm sim tawm ntawm qhov ntau ntawm cov lej (-2, 147, 483, 648 txog +2, 147, 483, 647). Hauv qhov no, koj yuav tsum siv DATEDIFF_BIG() ua haujlwm hloov.
SQL ntawv Server DATEDIFF () saib.
| date_part | Cov ntawv luv |
|---|---|
| hnub | dd, ua d |
| lub lim tiam | wb, ww |
| teev | hh |
| feeb | kuv, n |
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