華閱文章網怎么使用sql語句查詢日期所在周的一周各天
檢索日期所在周的一周各天日期方法 一、用到的函數有datepart(),dateadd() 1、datepart（)函數，返回代表指定日期的指定日期部分的整數。
語法：DATEPART ( datepart ,date ) 參數：datepart 是指定應返回的日期部分的參數。參數如下 2、DATEADD（) 函數在日期中添加或減去指定的時間間隔。
語法：DATEADD(datepart,number,date) date 參數是合法的日期表達式。number 是您希望添加的間隔數；對于未來的時間，此數是正數，對于過去的時間，此數是負數。
datepart 參數可以是下列的值： 二、以系統當前時間為例，檢索一周各天時間的語句如下： 1、DATEPART(weekday,getdate（)）返回的是整型數值1-7，分別代表周日、周一到周六 2、語句分別獲取周日到周六的日期時間，然后用union 進行檢索結果連接。 3、已獲取周日時間為例： DATEPART(weekday,getdate（)） 返回1，即當前日期就是周日，那么輸出當前時間getdate(), DATEPART(weekday,getdate（)） 返回2，即前日期是周一，那么周日是前一天，使用函數獲取前一天的日期：dateadd(dd,-1,getdate（)） 以此類推就獲取了日期所在周的周日日期時間。
select case when DATEPART(weekday,getdate())=1 then getdate() when DATEPART(weekday,getdate())=2 then dateadd(dd,-1,getdate()) when DATEPART(weekday,getdate())=3 then dateadd(dd,-2,getdate()) when DATEPART(weekday,getdate())=4 then dateadd(dd,-3,getdate()) when DATEPART(weekday,getdate())=5 then dateadd(dd,-4,getdate()) when DATEPART(weekday,getdate())=6 then dateadd(dd,-5,getdate()) when DATEPART(weekday,getdate())=7 then dateadd(dd,-6,getdate()) end as '日期'，'周日' unionselectcase when DATEPART(weekday,getdate())=1 then dateadd(dd,1,getdate()) when DATEPART(weekday,getdate())=2 then dateadd(dd,0,getdate()) when DATEPART(weekday,getdate())=3 then dateadd(dd,-1,getdate()) when DATEPART(weekday,getdate())=4 then dateadd(dd,-2,getdate()) when DATEPART(weekday,getdate())=5 then dateadd(dd,-3,getdate()) when DATEPART(weekday,getdate())=6 then dateadd(dd,-4,getdate()) when DATEPART(weekday,getdate())=7 then dateadd(dd,-5,getdate()) end as '日期'，'周一' unionselectcase when DATEPART(weekday,getdate())=1 then dateadd(dd,2,getdate()) when DATEPART(weekday,getdate())=2 then dateadd(dd,1,getdate()) when DATEPART(weekday,getdate())=3 then dateadd(dd,0,getdate()) when DATEPART(weekday,getdate())=4 then dateadd(dd,-1,getdate()) when DATEPART(weekday,getdate())=5 then dateadd(dd,-2,getdate()) when DATEPART(weekday,getdate())=6 then dateadd(dd,-3,getdate()) when DATEPART(weekday,getdate())=7 then dateadd(dd,-4,getdate()) end as '日期'，'周二' unionselectcase when DATEPART(weekday,getdate())=1 then dateadd(dd,3,getdate()) when DATEPART(weekday,getdate())=2 then dateadd(dd,2,getdate()) when DATEPART(weekday,getdate())=3 then dateadd(dd,1,getdate()) when DATEPART(weekday,getdate())=4 then dateadd(dd,0,getdate()) when DATEPART(weekday,getdate())=5 then dateadd(dd,-1,getdate()) when DATEPART(weekday,getdate())=6 then dateadd(dd,-2,getdate()) when DATEPART(weekday,getdate())=7 then dateadd(dd,-3,getdate()) end as '日期'，'周三' unionselectcase when DATEPART(weekday,getdate())=1 then dateadd(dd,4,getdate()) when DATEPART(weekday,getdate())=2 then dateadd(dd,3,getdate()) when DATEPART(weekday,getdate())=3 then dateadd(dd,2,getdate()) when DATEPART(weekday,getdate())=4 then dateadd(dd,1,getdate()) when DATEPART(weekday,getdate())=5 then dateadd(dd,0,getdate()) when DATEPART(weekday,getdate())=6 then dateadd(dd,-1,getdate()) when DATEPART(weekday,getdate())=7 then dateadd(dd,-2,getdate()) end as '日期'，'周四' unionselectcase when DATEPART(weekday,getdate())=1 then dateadd(dd,5,getdate()) when DATEPART(weekday,getdate())=2 then dateadd(dd,4,getdate()) when DATEPART(weekday,getdate())=3 then dateadd(dd,3,getdate()) when DATEPART(weekday,getdate())=4 then dateadd(dd,2,getdate()) when DATEPART(weekday,getdate())=5 then dateadd(dd,1,getdate()) when DATEPART(weekday,getdate())=6 then dateadd(dd,0,getdate()) when DATEPART(weekday,getdate())=7 then dateadd(dd,-1,getdate()) end as '日期'，'周五' unionselectcase when DATEPART(weekday,getdate())=1 then dateadd(dd,6,getdate()) when DATEPART(weekday,getdate())=2 then dateadd(dd,5,getdate()) when DATEPART(weekday,getdate())=3 then dateadd(dd,4,getdate()) when DATEPART(weekday,getdate())=4 then dateadd(dd,3,getdate()) when DATEPART(weekday,getdate())=5 then dateadd(dd,2,get。
sql 時間查詢語句
給傳遞過來的時間值加個引號
單引號：
SELECT * FROM cocl WHERE riqi>'"&request("kaishi")&"' AND riqi<'"&request("jieshu")&"' ORDER BY id DESC
雙引號：
SELECT * FROM cocl WHERE riqi>"""&request("kaishi")&""" AND riqi<"""&request("jieshu")&""" ORDER BY id DESC
在知道里看引號有點不清楚，你復制到記事本里看好點
-----------------------------------------------------
你的最終的SQL語句應該是
riqi>2001-01-01
還是
riqi>'2001-01-01'
如何查看sql語句執行時間
declare @sttime datetime
set @sttime=getdate()
print @sttime
Select * from case1219 -- 把你的sql語句放在這里
SELECT RTRIM(CAST(DATEDIFF(MS, @sttime, GETDATE()) AS CHAR(10))) AS 'TimeTaken'
或者這么寫
DECLARE @t1 DATETIME;
DECLARE @t2 DATETIME;
SET @t1 = GETDATE();
Select * from dimDate ；-- 把你要查詢的sql語句放在這里
SET @t2 = GETDATE();
SELECT DATEDIFF(millisecond,@t1,@t2) AS elapsed_ms;