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  • sql日期操作

    ----------------------------------------------------------------------------------------------------------------

    --取得日期所在周的第一天

    ----------------------------------------------------------------------------------------------------------------

    SELECT  DATEADD(wk,DATEDIFF(wk,0,getdate()),-1)

    ----------------------------------------------------------------------------------------------------------------

    --根据年和周,取得所在周的第一天

    ----------------------------------------------------------------------------------------------------------------

    declare @CurWeek nvarchar(10) = '2013_2';
    declare @Date datetime;
    declare @Week int;
     set @Week = convert(int,substring(@CurWeek,6,2));
    declare @Year varchar(4);
     set @Year = left(@CurWeek,4);
     
    --当年的第一天
    select @Date = dateadd(wk,@Week-1,@Year);
    --select dateadd(dd,1-datepart(dw,@Date),@date),dateadd(dd,7-datepart(dw,@Date),@Date)
    declare @WeekFstDate varchar(10);
     set @WeekFstDate = convert(varchar(10),dateadd(dd,1-datepart(dw,@Date),@Date),120);
    select @WeekFstDate;

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  • 原文地址:https://www.cnblogs.com/xiebin1986/p/2848110.html
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