Previous Month Function

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Previous Month Function

Marv_SQL

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November 24, 2010 at 12:49 pm

#231596

Hello,
Is there any commands or datediff functions that will always return the results for a prior month?
Let say I am running a query that has date filters between '9/1/2010' and '9/30/2010', can I do a date diff to also give me the results for the last full month? ('8/1/2010' and '8/31/2010')?
Thanks :hehe:
December 7, 2010 at 7:33 am

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WayneS SSC Guru Points: 95409 More actions · Answer 1

DateDiff(month, -1, '20100901')

Wayne
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Shanalise Hall of Fame Points: 3188 More actions · Answer 2

You can use DATEADD as below

declare @myDay datetime

set @myDay = dateadd(month, -1, getdate())

selectgetdate() 'today',

@myDay 'Lastmonth'

The Dixie Flatline SSC Guru Points: 53354 More actions · Answer 3

If I understand you correctly, you always want the start and end dates from the prior month, regardless of the starting and ending date that you provide. So even though February ends on the 28th, you'd still want to see all 31 days of January.

declare @startdate date = '2/1/2010'

declare @enddate date = '2/28/2010'

declare @priorStart date = dateadd(month,(DATEDIFF(month,0,@startdate)-1),0) -- first day of month prior to @startdate

declare @priorEnd date = dateadd(day,-1,dateadd(month,(DATEDIFF(month,0,@startdate)),0)) -- last day of prior month

;with dates as (select top 1000 cast(dateadd(day,row_number() over (order by id),'1/1/2009') as date) as testDate

from syscolumns

)

select testdate, case when testDate between @startdate and @enddate then 'CURRENT' else 'Previous' end as _month

from dates

where testDate between @startdate and @enddate

or testDate between @priorStart and @priorEnd

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Jeff Moden SSC Guru Points: 1003871 More actions · Answer 4

The Dixie Flatline (12/6/2010)
If I understand you correctly, you always want the start and end dates from the prior month, regardless of the starting and ending date that you provide. So even though February ends on the 28th, you'd still want to see all 31 days of January.

Ya beat me to it, Bob! I've seen the "enddate" mistake several times and glad someone picked up on it.

--Jeff Moden

RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
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The Dixie Flatline SSC Guru Points: 53354 More actions · Answer 5

Jeff Moden (12/6/2010)
The Dixie Flatline (12/6/2010)
If I understand you correctly, you always want the start and end dates from the prior month, regardless of the starting and ending date that you provide. So even though February ends on the 28th, you'd still want to see all 31 days of January.
Ya beat me to it, Bob! I've seen the "enddate" mistake several times and glad someone picked up on it.

Even a blind squirrel finds some nuts, Jeff. 😉

__________________________________________________

Against stupidity the gods themselves contend in vain. -- Friedrich Schiller
Stop, children, what's that sound? Everybody look what's going down. -- Stephen Stills

Evil Kraig F SSC Guru Points: 100851 More actions · Answer 6

The Dixie Flatline (12/7/2010)
Jeff Moden (12/6/2010)
The Dixie Flatline (12/6/2010)
If I understand you correctly, you always want the start and end dates from the prior month, regardless of the starting and ending date that you provide. So even though February ends on the 28th, you'd still want to see all 31 days of January.
Ya beat me to it, Bob! I've seen the "enddate" mistake several times and glad someone picked up on it.
Even a blind squirrel finds some nuts, Jeff. 😉

How did I get involved in... oh, wait... wrong nuts. Whoops... :w00t:

- Craig Farrell

Never stop learning, even if it hurts. Ego bruises are practically mandatory as you learn unless you've never risked enough to make a mistake.

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The Dixie Flatline SSC Guru Points: 53354 More actions · Answer 7

Nyuck, nyuck, nyuck.

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Against stupidity the gods themselves contend in vain. -- Friedrich Schiller
Stop, children, what's that sound? Everybody look what's going down. -- Stephen Stills