sql获取该周的开始结束日期

mssql函数

IF EXISTS ( SELECT 1 FROM sysobjects WHERE name = 'fn_GetWeekDate')  
    DROP FUNCTION fn_GetWeekDate  
GO
CREATE function [dbo].fn_GetWeekDate(
    @Year int,    --年份
	@Week int	--第几周
)
RETURNS @Table TABLE(beginTime datetime,endTime datetime)
AS
BEGIN
	declare @curYearStart datetime
	set @curYearStart = CONVERT(datetime,CONVERT(varchar(4),@Year) + '-01-01')
	declare @tmpdate datetime
	select @tmpdate=dateadd(week,@Week-1,@curYearStart)
	
	insert into @TABLE(beginTime,endTime)
	select 
		case when dateadd(day,-datepart(weekday,@tmpdate)+1,@tmpdate) < @curYearStart then @curYearStart else dateadd(day,-datepart(weekday,@tmpdate)+1,@tmpdate) end,
		dateadd(day,7-datepart(weekday,@tmpdate),@tmpdate)
	
	return
END
go

使用

select * from fn_GetWeekDate(2016,2)

结果

beginTime               endTime
----------------------- -----------------------
2016-01-03 00:00:00.000 2016-01-09 00:00:00.000