Dab tsi yog hnub tim hom ntawv hauv SQL?

Video: Dab tsi yog hnub tim hom ntawv hauv SQL?

2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47

Default tso zis hom

SQL Server tso hnub, sijhawm thiab hnub tim tus nqi hauv cov qauv hauv qab no: yyyy-mm-dd ,,h:m s. nnnnnnn (n yog nyob ntawm kab lus txhais) thiab yyyy-mm-dd hh:mm:ss.

Ib yam li ntawd, hnub tim hom ntawv hauv Oracle yog dab tsi?

DD-MON-YY

Tsis tas li ntawd, txhais tau li cas hnub hauv SQL query? Taw qhia rau SQL Server DATE Hauv hom ntawv no: YYYY yog plaub tus lej uas sawv cev rau ib xyoos, uas nyob ntawm 0001 txog 9999. MM yog ob tus lej uas sawv cev rau ib hlis ntawm ib xyoos, uas nyob ntawm 01 txog 12. DD yog ob tus lej uas sawv cev rau ib hnub ntawm qhov teev tseg. lub hli, uas nyob ntawm 01 txog 31, nyob ntawm lub hli.

Qhov thib ob, kuv yuav hloov lub hnub tim hom ntawv hauv SQL Server li cas?

Muaj cov cai uas peb yuav tsum tau ua hloov default date format hauv sql server . Cov default date format ntawm SQL ntawv yog mdy(U. S. English). Tam sim no mus hloov sql server default date format los ntawm "mdy"(mm/dd/yyyy) mus rau "dmy"(dd/mm/yyyy), peb yuav tsum siv SET DATEFORMAT lus txib.

Dab tsi yog hom DATE datatype hauv Oracle?

Hom DATETIME yog siv rau qhov tseem ceeb uas muaj ob qho tib si hnub thiab lub sijhawm. MySQL retrieves thiab qhia DATETIME qhov tseem ceeb hauv 'YYYY-MM-DD HH:MM:SS' hom ntawv . Qhov kev txhawb nqa yog '1000-01-01 00: 00: 00' rau '9999-12-31 23: 59: 59'. Lub TIMESTAMP hom ntaub ntawv yog siv rau qhov tseem ceeb uas muaj ob qho tib si hnub thiab lub sijhawm.

Pom zoo:

Dab tsi yog lub hom phiaj ntawm delimiters nyob rau hauv cov ntawv sau npe ob hom ntawv cov ntaub ntawv delimiters?

Cov ntaub ntawv delimited yog cov ntawv nyeem siv los khaws cov ntaub ntawv, uas txhua kab sawv cev rau ib phau ntawv, tuam txhab, lossis lwm yam, thiab txhua kab muaj cov teb sib cais los ntawm tus lej

Yuav ua li cas hloov ib hnub hom mus rau lwm hnub hauv SQL?

Yuav ua li cas kom tau txais SQL neeg rau zaub mov sib txawv hnub hom Siv lub hnub hom kev xaiv nrog rau CONVERT muaj nuj nqi. Kom tau YYYY-MM-DD siv SELECT CONVERT(varchar, getdate(), 23) Kom tau MM/DD/YYYY siv SELECT CONVERT(varchar, getdate(), 1) Mus saib daim ntawv kom tau ib daim ntawv teev tag nrho cov hom kev xaiv

Dab tsi yog hom ntawv cov ntaub ntawv hauv SQL Server?

Nws yog Non-Unicode loj sib txawv ntev lub cim cov ntaub ntawv hom, uas tuaj yeem khaws qhov siab tshaj plaws ntawm 2147483647 Cov Cim Tsis-Unicode (piv txwv li qhov muaj peev xwm cia siab tshaj plaws yog: 2GB). Version ntawm Sql Server nyob rau hauv uas nws tau qhia? Cov ntaub ntawv hom yog tam sim no los ntawm cov qub versions ntawm Sql Server