datetime to seconds sql
2010年5月26日—IwanttoconvertDatetimeornvarcharofformathh:mm:sstoseconds.Wheremydate1anddate2arenotpre-defined.Ihaveatablewithtwo ...,Definesadatethatiscombinedwithatimeofdaywithfractionalsecondsthatisbasedona24-hourclock.Note.Usethetime,date,date...
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2012年5月17日—Createanewcolumn(ALTERTABLE)thenrunanUPDATEonit.UPDATEMyTableSETNewIntColumn=DATEDIFF(SECOND,'19000101',MyDateTimeColumn).
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