查找前x天的記錄嗎？

Question

我怎樣才能想出一個存儲過程來選擇過去30天的結果？

where MONTH(RequestDate) > 6 and DAY(RequestDate) >= 10 
and MONTH(RequestDate) < 21 and DAY(RequestDate) < 7 

Answer 1

SELECT * 
FROM Table 
WHERE GETDATE() >= DATEADD(DAY, -30, GETDATE()) 

替代第一GETDATE（）與適當的列名稱。

SELECT * 
FROM Table 
WHERE Table.ColumnName >= DATEADD(DAY, -30, GETDATE()) 

Answer 2

是這樣的嗎？

CREATE PROC GetSomeHistory 

    @NumDaysPrevious int 

    AS 
    BEGIN 
     SELECT * FROM MyTable 
     WHERE RequestDate BETWEEN DATEADD(dd, -1 * @NumDaysPrevious, getdate()) 
          AND getdate(); 
    END 

    ...... 

    EXEC GetSomeHistory 55; 

Answer 3

您是否在尋找過去的30天或上個月？要了解啓動和每個月的月底（「通用」爲您的評論說），用途：

select dateadd(month,datediff(month,0,getdate()),0), 
    dateadd(mm,datediff(mm,-1,getdate()),-1) 

Answer 4

SELECT * 
FROM Table 
WHERE myDate >= DATEADD(MONTH, -1, GETDATE()) 

每月做起來比在30天的模塊做不同的。測試此列如下......

declare @mydate smalldatetime 
set @mydate = '07/6/01' 

select @mydate 
select DATEADD(month, 2, @mydate), DATEDIFF(day, DATEADD(month, 2, @mydate), @mydate) 
select DATEADD(month, 1, @mydate), DATEDIFF(day, DATEADD(month, 1, @mydate), @mydate) 
select DATEADD(month, -1, @mydate), DATEDIFF(day, DATEADD(month, -1, @mydate), @mydate) 
select DATEADD(month, -2, @mydate), DATEDIFF(day, DATEADD(month, -2, @mydate), @mydate) 
select DATEADD(month, -3, @mydate), DATEDIFF(day, DATEADD(month, -3, @mydate), @mydate) 

下面是結果：

2001-07-06 00:00:00 
2001-09-06 00:00:00 | -62 
2001-08-06 00:00:00 | -31 
2001-06-06 00:00:00 | 30 
2001-06-06 00:00:00 | 30 
2001-05-06 00:00:00 | 61 
2001-04-06 00:00:00 | 91