Question

当GETDATE（）作为输入时，是否可以获得一个月第一周的日期。

我可以通过以下代码获取当周的日期： -

select  
    convert(varchar(50), dateadd(dd, - datepart(dw, GETDATE()) + 1, GETDATE()), 101),
    convert(varchar(50), dateadd(dd, - datepart(dw, GETDATE()) + 7, GETDATE()), 101)

如何根据GETDATE()作为输入获取该月第一周，第二周的日期？

例如：

2016年7月的1周工作日期： - 2016年1月7日 - 2016年2月7日
2周工作日期： - 2016年4月7日 - 2016年9月7日

由于

编辑： - 我使用以下查询来获取给定月份的每周开始和结束日期： -

DECLARE @date date = '2016-07-08'--sample date
DECLARE @firstDay date = DATEADD(M, DATEDIFF(M, 0, @date), 0)
DECLARE @firstWeekLastDay date = DATEADD(D, 7-DATEPART(DW, @firstDay), @firstDay)
DECLARE @secondWeekFirstDay date = DATEADD(D, 2, @firstWeekLastDay)
DECLARE @secondWeekLastDay date = DATEADD(D, 5, @secondWeekFirstDay)
DECLARE @thirdWeekfirstDay date = DATEADD(D, 2, @secondWeekLastDay)
DECLARE @thirdWeekLastDay date = DATEADD(D, 5, @thirdWeekfirstDay)
DECLARE @fourthWeekFirstDay date = DATEADD(D, 2, @thirdWeekLastDay)
DECLARE @fourthWeekLastDay date = DATEADD(D, 5, @fourthWeekFirstDay)
DECLARE @fifthWeekFirstDay date = DATEADD(D, 2, @fourthWeekLastDay)
DECLARE @fifthWeekLastDay date = DATEADD(D, 5, @fifthWeekFirstDay)

SELECT @firstDay, @firstWeekLastDay, @secondWeekFirstDay, @secondWeekLastDay, @thirdWeekfirstDay, @thirdWeekLastDay, @fourthWeekFirstDay, @fourthWeekLastDay

Answer 1

您可以使用以下查询获取范围：

(testEnv) Extra Drive 1 > echo $PATH
/media/suraj/Extra\ Drive\ 1/testEnv/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/home/suraj/.config/composer/vendor/bin/:/usr/local/aws/bin

您还可以计算当月的第一个星期日：

DECLARE @date date = '2016-07-08'--sample date
DECLARE @firstDay date = DATEADD(M, DATEDIFF(M, 0, @date), 0)

SELECT CASE DATEPART(DW, @firstDay)
       WHEN 1 THEN DATEADD(D, 1, @firstDay)
       ELSE @firstDay END D1,
       DATEADD(D, 7-DATEPART(DW, @firstDay), @firstDay) D2

第一周将从DECLARE @date date = '2016-08-01' DECLARE @firstDayOfMonth date = DATEADD(M, DATEDIFF(M, 0, @date), 0) DECLARE @firstSundayOfMonth date = DATEADD(D, (DATEDIFF(D, '2016-08-07', @firstDayOfMonth))/7*7, '2016-08-07')到1，第二周 - 从sunday-1到sunday+1。

Answer 2

这将为您提供该月第1周和第2周的所有日期，除了基于GETDATE（）的星期日。如果要测试特定日期，只需更改@date变量的值。

DECLARE @dt1 Datetime, @dt2 Datetime
DECLARE @date Datetime = GETDATE()

SELECT @dt1 = DATEADD(MM, DATEDIFF(MM, 0, @date), 0) 
SELECT @dt2 = DATEADD(DD,14 , @dt1 )

;WITH daterange 
AS 
(
    SELECT [dates]=@dt1 ,
          DATEPART(WEEKDAY, @dt1) WD, --Weekday
          DATEPART(DD,@dt1) [DAY], -- Day
          1 WN -- Week no.
    UNION ALL
    SELECT [dates] + 1 , 
         DATEPART(WEEKDAY, [dates] + 1) WD, --Weekday
         DATEPART(DD,[dates] + 1) [DAY],  --Day
         CASE WHEN DATEPART(WEEKDAY, [dates] + 1) = 1 AND [DAY]<>1 THEN WN + 1 ELSE WN END WN  --Week no.
    FROM   daterange 
    WHERE  [dates] + 1<= @dt2
) 
SELECT [dates]
FROM   daterange C
WHERE WN <= 2 AND WD <> 1

SQL Server：获取一个月的第一周和第二周的日期范围

2 个答案: