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How do I query a date range from beginning to end of the previous month in YYYYMMDD format?

Posted on 2011-03-17
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Last Modified: 2012-05-11
I currently have a large amount of SQL queries built for the purpose of Month End reporting.  A common factor in these queries is retrieving total counts in tables between the first and last days of the previous month.  The field in question is BookDate, which is formatted as YYYYMMDD.  

Example:
Say today is March 1st, 2011 (20110301) and I want a total count of transactions in the ActivityHist table that are cash from February 1st, 2011 (20110201) through February 28th (20110228)... (See Attached Code)

Currently, I manually change all BookDate info to reflect the previous month... How can I do this automatically?

Regards,

NCollinsBBP


SELECT COUNT(*)
FROM ActivityHist
WHERE CashTran = '1' AND
      BookDate >= '20110201' AND BookDate <= '20110228'

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Question by:NCollinsBBP
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5 Comments
 
LVL 18

Expert Comment

by:lludden
ID: 35158524
To get the first and last day of the previous month,

SELECT DATEADD(d,-1,DATEADD(mm, DATEDIFF(m,0,GETDATE()),0)) AS LastDayPrevMonth,
      CONVERT(VARCHAR(25),DATEADD(dd,-(DAY(GETDATE())-1),CAST(GETDATE() as date)),101) AS FirstDayPrevMonth
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LVL 18

Expert Comment

by:lludden
ID: 35158570
If you need this formatted as a string, then use CONVERT to change to YYYYMMDD format,

SELECT CAST(varchar(8),getdate(),112)

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Author Comment

by:NCollinsBBP
ID: 35159056
If you don't mind, how exactly can I incorporate that into the query I attached?  The BookDate field in my database is plain text and not a datetime field....
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LVL 23

Accepted Solution

by:
wdosanjos earned 250 total points
ID: 35159420
Try:

SELECT COUNT(*)
FROM ActivityHist
WHERE CashTran = '1' AND
      left(BookDate,6) = left(convert(varchar(8),dateadd(mm,-1,getdate()),112),6)

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I hope this helps.
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Author Closing Comment

by:NCollinsBBP
ID: 35159503
Perfection!
This solution gave me the same exact result as my attached query from my original post.
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