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问题:
I am looking for a SQL-function that gives the last 12 months with Start Date and End Date. Say you pick 10.Dec, it will give a result in:
- StartDate -- EndDate - 2013-11-01 - 2013-11-30 - 2013-10-01 - 2013-10-31 - 2013-09-01 - 2013-09-30
and so it goes for the last 12 months.
I tried modifying an old function we had, but I got totally off and confused in the end.
ALTER FUNCTION [dbo].[Last12Months](@Date date) RETURNS TABLE AS Return ( with cte as ( SELECT DATEADD(mm, DATEDIFF(mm, 01, @Date), 01) AS Start, DATEADD(mm, DATEDIFF(mm, -12, @Date), -12) AS EndDate union all select Start - 1, EndDate - 1 from cte where Start >= @Date ) select CAST(Start as DATE) StartDate, CAST(EndDate as DATE) EndDate from cte)
Runned it like this:
select * from dbo.Last12Months ('2013-12-10')
and got:
- StartDate - EndDate - 2013-12-02 - 2013-12-20
Anyone know what to do?
回答1:
Please try using CTE:
ALTER FUNCTION [dbo].[Last12Months] ( @Date datetime ) RETURNS @tbl TABLE (Start datetime, EndDate datetime) AS BEGIN WITH T AS( SELECT DATEADD(month, DATEDIFF(month, 0, @Date), 0) AS Start, DATEADD(d, -DAY(DATEADD(m,1,@date)),DATEADD(m,1,@date)) AS EndDate, 12 Cnt UNION ALL SELECT DATEADD(month, -1, Start), DATEADD(d, -DAY(DATEADD(m,1,Start-1)),DATEADD(m,1,Start-1)), Cnt-1 FROM T WHERE Cnt-1>0 ) INSERT INTO @tbl (Start, EndDate) SELECT Start, EndDate FROM T RETURN END
回答2:
This seems to do the job - whether you want to put it in a function or just wherever you need to have the data:
; With Numbers as ( select ROW_NUMBER() OVER (ORDER BY number ) as n from master..spt_values ), Months as ( select DATEADD(month,n,'20010101') as start_date, DATEADD(month,n,'20010131') as end_date from Numbers ) select * from Months where DATEDIFF(month,start_date,GETDATE()) between 0 and 11
(Substitute any other date for GETDATE() if you want to get it based on some other date)
(On my machine, this can generate any month from January 2001 on to at least the next century - it can be adjusted if you need earlier or later dates also)
回答3:
Damn, you've got to be quick on SO!
Good use of CTEs: i've learnt a bit answering this...
alter function Last12Months(@d date) returns table as return( with cte as ( select dateadd(month, datepart(mm,@d)-13, dateadd(year,datepart(yyyy,@d)-1900,0) ) as start union all select dateadd(mm, 1, start) from cte where start < @d) select start, dateadd(mm, 1, start) ends from cte where start < @d ) go select * from Last12Months('2014-06-04')
Removed conversion to varchar thanks to Date serial in SQL?
This returns 13 months: from say June last year to this June, inclusive.
To return the previous 12 months, not including the current June, change the final start<@d to
where start < dateadd(month, datepart(mm,@d)-1, dateadd(year,datepart(yyyy,@d)-1900,0))
The end is 00:00 hours on the first day of the next month.
回答4:
check this,
Declare @i date='2013-12-10' ;with cte as (Select dateadd(month,datediff(month,0,@i)-1,0) StartDate ,dateadd(day,-1,dateadd(month,datediff(month,0,@i),0)) EndDate ,1 rownum Union all select dateadd(month,-1,StartDate),dateadd(day,-1,StartDate),rownum+1 rownum from cte where rownum<12 ) select * from cte
回答5:
Try this it might help you
select top 12 * from YourTable where dateOf between @DateFrom and @DateTo order by dateOf desc
回答6:
@Lebowski Below script will give you start and end date of specified calendar months from today in chronological order
DECLARE @nMonths TINYINT SET @nMonths = 60 SELECT FORMAT(DATEADD(month, n.n - @nMonths+1+ DATEDIFF(month, 0, GETDATE()) -1 ,0), 'yyyy-MM-dd') AS MonthStartDate , FORMAT(DATEADD(dd, -1, DATEADD(month, n.n - @nMonths+1 + DATEDIFF(month, 0, GETDATE()),0)), 'yyyy-MM-dd') AS MonthEndDate FROM (SELECT TOP(@nMonths) n = ROW_NUMBER() OVER (ORDER BY NAME) FROM master.dbo.syscolumns) n
Sample output
MonthStartDate MonthEndDate 2011-04-01 2011-04-30 2011-05-01 2011-05-31 2011-06-01 2011-06-30 2011-07-01 2011-07-31 2011-08-01 2011-08-31 2011-09-01 2011-09-30 2011-10-01 2011-10-31 2011-11-01 2011-11-30 2011-12-01 2011-12-31 ....
