Apr 16, 2012

SQL SERVER – Few Useful DateTime Functions to Find Specific Dates

want to get the records of last month based on my db table [member] field "date_created". What's the sql to do this?
For clarification, last month - 1/8/2009 to 31/8/2009
If today is 3/1/2010, I'll need to get the records of 1/12/2009 to 31/12/2009.

select field1, field2, fieldN from TABLE where DATEPART(month, date_created) = (DATEPART(month, GETDATE()) - 1) and 
DATEPART(year, date_created) = DATEPART(year, DATEADD(m, -1, GETDATE()))

datediff(day, <ngày bắt đầu>, <ngày kết thúc>)

SELECT DATEADD(d,-1,GETDATE()) 'Yesterday'
----First Day of Current Week
SELECT DATEADD(wk,DATEDIFF(wk,0,GETDATE()),0) 'First Day of Current Week'
----Last Day of Current Week
SELECT DATEADD(wk,DATEDIFF(wk,0,GETDATE()),6) 'Last Day of Current Week'
----First Day of Last Week
SELECT DATEADD(wk,DATEDIFF(wk,7,GETDATE()),0) 'First Day of Last Week'
----Last Day of Last Week
SELECT DATEADD(wk,DATEDIFF(wk,7,GETDATE()),6) 'Last Day of Last Week'
----First Day of Current Month
SELECT DATEADD(mm,DATEDIFF(mm,0,GETDATE()),0) 'First Day of Current Month'
----Last Day of Current Month
SELECT DATEADD(ms,- 3,DATEADD(mm,0,DATEADD(mm,DATEDIFF(mm,0,GETDATE())+1,0))) 'Last Day of Current Month'
----First Day of Last Month
SELECT DATEADD(mm,-1,DATEADD(mm,DATEDIFF(mm,0,GETDATE()),0)) 'First Day of Last Month'
----Last Day of Last Month
SELECT DATEADD(ms,-3,DATEADD(mm,0,DATEADD(mm,DATEDIFF(mm,0,GETDATE()),0))) 'Last Day of Last Month'
----First Day of Current Year
SELECT DATEADD(yy,DATEDIFF(yy,0,GETDATE()),0) 'First Day of Current Year'
----Last Day of Current Year
SELECT DATEADD(ms,-3,DATEADD(yy,0,DATEADD(yy,DATEDIFF(yy,0,GETDATE())+1,0))) 'Last Day of Current Year'
----First Day of Last Year
SELECT DATEADD(yy,-1,DATEADD(yy,DATEDIFF(yy,0,GETDATE()),0)) 'First Day of Last Year'
----Last Day of Last Year
SELECT DATEADD(ms,-3,DATEADD(yy,0,DATEADD(yy,DATEDIFF(yy,0,GETDATE()),0))) 'Last Day of Last Year'
2008-08-29 21:54:58.967
2008-08-28 21:54:58.967
First Day of Current Week
2008-08-25 00:00:00.000
Last Day of Current Week
2008-08-31 00:00:00.000
First Day of Last Week
2008-08-18 00:00:00.000
Last Day of Last Week
2008-08-24 00:00:00.000
First Day of Current Month
2008-08-01 00:00:00.000
Last Day of Current Month
2008-08-31 23:59:59.997
First Day of Last Month
2008-07-01 00:00:00.000
Last Day of Last Month
2008-07-31 23:59:59.997
First Day of Current Year
2008-01-01 00:00:00.000
Last Day of Current Year
2008-12-31 23:59:59.997
First Day of Last Year
2007-01-01 00:00:00.000
Last Day of Last Year
2007-12-31 23:59:59.997


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