sql-server - year - t sql getdate add month




MS SQL比較日期? (4)

我有2個日期(日期時間):

date1 = 2010-12-31 15:13:48.593
date2 = 2010-12-31 00:00:00.000

同一天,只是不同的時間。 使用<=比較date1和date2因為date1時間不起作用。 所以date1 <= date2是錯的,但應該是真的。 我可以通過僅查看年份,月份和日期來比較它們,因此它們是相同的嗎? 它的SQL Server 2008。

謝謝 :)


使用帶有日期部分的DATEDIFF函數。

SELECT ...
FROM ...
WHERE DATEDIFF(day, date1, date2) >= 0

請注意,如果要測試date1 <= date2則需要測試DATEDIFF(day, date1, date2) >= 0 ,或者可以測試DATEDIFF(day, date2, date1) <= 0


嘗試這個:

BEGIN

declare @Date1 datetime
declare @Date2 datetime

declare @chkYear int
declare @chkMonth int
declare @chkDay int
declare @chkHour int
declare @chkMinute int
declare @chkSecond int
declare @chkMiliSecond int

set @Date1='2010-12-31 15:13:48.593'
set @Date2='2010-12-31 00:00:00.000'

set @chkYear=datediff(yyyy,@Date1,@Date2)
set @chkMonth=datediff(mm,@Date1,@Date2)
set @chkDay=datediff(dd,@Date1,@Date2)
set @chkHour=datediff(hh,@Date1,@Date2)
set @chkMinute=datediff(mi,@Date1,@Date2)
set @chkSecond=datediff(ss,@Date1,@Date2)
set @chkMiliSecond=datediff(ms,@Date1,@Date2)

if @chkYear=0 AND @chkMonth=0 AND @chkDay=0 AND @chkHour=0 AND @chkMinute=0 AND @chkSecond=0 AND @chkMiliSecond=0
    Begin
        Print 'Both Date is Same'
    end
else
    Begin
        Print 'Both Date is not Same'
    end
End

簡單的一行解決方案是

datediff(dd,'2010-12-31 15:13:48.593','2010-12-31 00:00:00.000')=0

datediff(dd,'2010-12-31 15:13:48.593','2010-12-31 00:00:00.000')<=1

datediff(dd,'2010-12-31 15:13:48.593','2010-12-31 00:00:00.000')>=1

您可以嘗試使用除“dd”之外的各種選項


SELECT CASE WHEN CAST(date1 AS DATE) <= CAST(date2 AS DATE) ...

應該做你需要的。

測試用例

WITH dates(date1, date2, date3, date4)
     AS (SELECT CAST('20101231 15:13:48.593' AS DATETIME),
                CAST('20101231 00:00:00.000' AS DATETIME),
                CAST('20101231 15:13:48.593' AS DATETIME),
                CAST('20101231 00:00:00.000' AS DATETIME))
SELECT CASE
         WHEN CAST(date1 AS DATE) <= CAST(date2 AS DATE) THEN 'Y'
         ELSE 'N'
       END AS COMPARISON_WITH_CAST,
       CASE
         WHEN date3 <= date4 THEN 'Y'
         ELSE 'N'
       END AS COMPARISON_WITHOUT_CAST
FROM   dates 

返回

COMPARISON_WITH_CAST   |  COMPARISON_WITHOUT_CAST
Y                         N




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