SQL获取本周，上周，本月，上月第一天和最后一天 注：本周从周一到周天

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DECLARE @ThisWeekStartTime NVARCHAR(100),@ThisWeekEndTime NVARCHAR(100),--本周             @LastWeekStartTime NVARCHAR(100),@LastWeekEndTime NVARCHAR(100),--上周             @ThisMonthStartTime NVARCHAR(100),@ThisMonthEndTime  NVARCHAR(100),--本月             @LastMonthSartTime NVARCHAR(100),@LastMonthEndTime NVARCHAR(100),--上月             @LastestHalfYearStartTime NVARCHAR(100),@LastestHalfYearEndTime NVARCHAR(100),--近半年             @LastestOneYearStartTime NVARCHAR(100),@LastestOneYearEndTime NVARCHAR(100)--近一年                   SELECT @ThisWeekStartTime= CONVERT(nvarchar(10), DATEADD(wk, DATEDIFF(wk,0,DATEADD(dd, -1, getdate()) ), 0),121)--本周开始时间     SELECT @ThisWeekEndTime= CONVERT(nvarchar(10), DATEADD(wk, DATEDIFF(wk,0,DATEADD(dd, -1, getdate()) ), 6),121)--本周结束时间           SELECT @LastWeekStartTime=  CONVERT(nvarchar(10),DATEADD(wk, DATEDIFF(wk,0,DATEADD(dd, -7, getdate()) ), 0),121)--上周开始时间     SELECT @LastWeekEndTime= CONVERT(nvarchar(10), DATEADD(wk, DATEDIFF(wk,0,DATEADD(dd, -7, getdate()) ), 6),121)--上周结束时间            SELECT @ThisMonthStartTime=CONVERT(nvarchar(10),dateadd(dd,-day(getdate())+1,getdate()),121)--本月开始时间     SELECT @ThisMonthEndTime=CONVERT(nvarchar(10),dateadd(dd,-day(getdate()),dateadd(m,1,getdate())),121)--本月结束时间           SELECT @LastMonthSartTime=CONVERT(nvarchar(10),dateadd(dd,-day(dateadd(month,-1,getdate()))+1,dateadd(month,-1,getdate())),121)--上月开始时间     SELECT @LastMonthEndTime= CONVERT(nvarchar(10), dateadd(dd,-day(getdate()),getdate()),121) --上月结束时间        SELECT @LastestHalfYearStartTime= CONVERT(nvarchar(10),  dateadd(dd,-day(dateadd(month,-6,getdate()))+1,dateadd(month,-6,getdate())) ,121)--近半年开始时间     SELECT @LastestHalfYearEndTime=CONVERT(nvarchar(10), dateadd(dd,-day(getdate()),getdate()),121)--近半年结束时间           SELECT @LastestOneYearStartTime= CONVERT(nvarchar(10), dateadd(dd,-day(dateadd(month,-12,getdate()))+1,dateadd(month,-12,getdate())) ,121)--近一年开始时间     SELECT @LastestOneYearEndTime=CONVERT(nvarchar(10), dateadd(dd,-day(getdate()),getdate()),121)--近一年结束时间 当前时间 select getdate() 当前时间周的起始日期（以周一为例）select DATEADD(week,DATEDIFF(week,0,getdate()),0) 上周起始：select dateadd(week,-1,DATEADD(week,DATEDIFF(week,0,getdate()),0)) 上上周起始：select dateadd(week,-2,DATEADD(week,DATEDIFF(week,0,getdate()),0)) 上上上周起始：select dateadd(week,-3,DATEADD(week,DATEDIFF(week,0,getdate()),0))