find records from previous x days? - sql

Question

How can I come up with a stored procedure that selects results for past 30 days?
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())
Substitute the first GETDATE() with the appropriate column name.
SELECT *
FROM Table
WHERE Table.ColumnName >= DATEADD(DAY, -30, GETDATE())

Answer 2

Are you looking for last 30 days or last month? To find start and end of each month ("generic" as your comment says), use:
select dateadd(month,datediff(month,0,getdate()),0),
dateadd(mm,datediff(mm,-1,getdate()),-1)

Answer 3

Something like this?
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 4

SELECT *
FROM Table
WHERE myDate >= DATEADD(MONTH, -1, GETDATE())
doing it by month is different than doing it in 30-day blocks. Test this out as follows...
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)
Here are the results:
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