Percentage Difference Calculation!

I have a table as follows:
Year Month Value %Diff
2004 Jul 200
Aug 100
etc etc
2003 Jul 300
Aug 400
etc etc
I need to be able to calculate the % difference for each month compared to
the same month for the previous year. The Previous() function is close to
what I need but not close enough. Any help would be much appreciated?If you have control over the source query, a LEFT OUTER JOIN ... ON
a.Month=b.Month and a.Year=b.Year-1 would bring back the data you need on
each row to calculate the diff. As you can see from this post and others,
my philosophy is not to jump through major coding hoops in the report if you
can easily solve it in the SQL query.
--
'(' Jeff A. Stucker
\
Business Intelligence
www.criadvantage.com
---
"St Matthew" <StMatthew@.discussions.microsoft.com> wrote in message
news:676C6EB0-0383-4BE6-86E5-58DFF89AA30B@.microsoft.com...
>I have a table as follows:
> Year Month Value %Diff
> 2004 Jul 200
> Aug 100
> etc etc
> 2003 Jul 300
> Aug 400
> etc etc
> I need to be able to calculate the % difference for each month compared to
> the same month for the previous year. The Previous() function is close to
> what I need but not close enough. Any help would be much appreciated?|||I should have mentioned in my SQL examples below that a and b are aliases
for the same table.
Cheers,
--
'(' Jeff A. Stucker
\
Business Intelligence
www.criadvantage.com
---
"Jeff A. Stucker" <jeff@.mobilize.net> wrote in message
news:OZdTrAb0EHA.3584@.TK2MSFTNGP11.phx.gbl...
> If you have control over the source query, a LEFT OUTER JOIN ... ON
> a.Month=b.Month and a.Year=b.Year-1 would bring back the data you need on
> each row to calculate the diff. As you can see from this post and others,
> my philosophy is not to jump through major coding hoops in the report if
> you can easily solve it in the SQL query.
> --
> '(' Jeff A. Stucker
> \
> Business Intelligence
> www.criadvantage.com
> ---
> "St Matthew" <StMatthew@.discussions.microsoft.com> wrote in message
> news:676C6EB0-0383-4BE6-86E5-58DFF89AA30B@.microsoft.com...
>>I have a table as follows:
>> Year Month Value %Diff
>> 2004 Jul 200
>> Aug 100
>> etc etc
>> 2003 Jul 300
>> Aug 400
>> etc etc
>> I need to be able to calculate the % difference for each month compared
>> to
>> the same month for the previous year. The Previous() function is close
>> to
>> what I need but not close enough. Any help would be much appreciated?
>