SQL Previous month and YTD

Posted on 2013-01-24
Last Modified: 2013-01-30
I need to expand on a solution that I received here. I wanted to get the past 3 months of data from the current date with each month separate. For example:

(@MyDate>= DATEADD(month, DATEDIFF(month, 0, GETDATE()) - 2, 0)) AND (@MyDate< DATEADD(month, DATEDIFF(month, 0, GETDATE()) - 1, 0))

This would get data from 2 months ago. I'm now being tasked to get data from 2 months ago plus ytd at that point in time. So, November 2012 and January 2012 - November 2012. I need this to be dynamic as the months shift. Any suggestions?

Question by:LCNW
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LVL 22

Accepted Solution

Steve Wales earned 500 total points
ID: 38816122
Here's a nice little blog post that expands upon the above and shows you how to get first and last days of this, last and next year:

If you need to get the first of the year starting 2 months ago, instead of using "getdate()" in the calculation for "first of the year" you'd use your starting calc of "DATEADD(month, DATEDIFF(month, 0, GETDATE()) - 2, 0))"

So first of the year, starting at your starting date would be

DATEADD(YEAR, DATEDIFF(YEAR, 0, DATEADD(month, DATEDIFF(month, 0, GETDATE()) - 2, 0))), 0)

Author Comment

ID: 38816971
This works great until I start a new year. I need it to reset at that point. For instance, in January it does January 2013 back to January 2012. I would only want January 2013 back to January 2013 as it's a new year.
LVL 22

Expert Comment

by:Steve Wales
ID: 38817005
If you're wanting YTD based upon the current date instead of the beginning date, just use getdate() as shown in the blog post ?
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Author Comment

ID: 38819673
I think I need to do something where I say AND year=year. This way it keeps the YTD on the correct year. I'm just not sure how to code it.
LVL 22

Assisted Solution

by:Steve Wales
Steve Wales earned 500 total points
ID: 38819744
You can extract year from a date using the DATEPART function

DATEPART(yy, getdate())

Set your variable or where clause based upon that and you'd be set.

where DATEPART(yy, YourColumn) = DATEPART(yy, @YourVariable).

Just remember that using a function on the left column of a where clause like that upsets the optimizer and it can't use an index to fulfill the requirement (unless you have othere conditions in there that force the index search first.

Author Comment

ID: 38836535
I haven't been able to figure out the code for the second part of my logic. Thanks for the help.

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