How to calculate difference and percentage in matrix report dynamic columns in SSRS 2008

Question

Hi Friends,
I need to calculate Difference and Percentage In matrix report SSRS 2008
1) Row grouping based On Product
2) Column Grouping Week and Fiscal Year Current week  and Previous Year same Weeks 
3)Data Invnetory(Value fileld)
Example:
If value1 and Value2 Available we need to calculate Percentage and Difference.Otherwise Not required NA I need to Show.
For example If Particular week,Current year data is available,Previous year  week data is not available No
need to cal Diff and Percentage we need to show Empty.
Below Code is working for If two values is available.
If any one of the fiscal year week data is not there it's taking some garbage values.
I tries with If condition in GetPCT() and GetDiff() It's not working.
Can some one please help me on this.
I am using the custom code 
Public Shared Value1 as String
Public Shared Value2 as String
Public Shared previous as string
Public Shared previousweek as string
Public Shared Function GetValue(Value as String,partner as String,Week as String) as String
If partner =previous and Week =previousweek Then
Value2=Value
Else
previous=partner
previousweek=Week
Value1=Value
End If
return Value
End Function
Public Shared Function GetDiff()
return Value2-Value1
End Function
Public Shared Function GetPct()
return (Value2-Value1)/Value1
End Function
How to handle this.
Thank You, Manasa.V

Answer 1

Hi veerapaneni,
According to your description, if one of the fiscal year week doesn’t have data, the custom code returns false results.
For your requirement, if NULL value exists in the database, we should replace it as zero then perform calculate. So within the code, we should judge whether the value is NULL. To achieve your goal, please refer to the steps below:
1. Create a table like below.
create table dif4
([Product Group] varchar(50),
[Week] varchar(50),
[Fiscalyearweek] varchar(50),
value int
insert into dif4 values
('Desktops','W01','FY14W01',0),
('Desktops','W01','FY15W01',45),
('Desktops','W02','FY14W02',null),
('Desktops','W02','FY15W02',30),
('Desktops','W03','FY14W03',12),
('Desktops','W03','FY15W03',50),
('Notebooks','W01','FY14W01',35),
('Notebooks','W01','FY15W01',56),
('Notebooks','W02','FY14W02',45),
('Notebooks','W02','FY15W02',87),
('Notebooks','W03','FY14W03',75),
('Notebooks','W03','FY15W03',105),
('Tablets','W01','FY14W01',34),
('Tablets','W01','FY15W01',46),
('Tablets','W02','FY14W02',49),
('Tablets','W02','FY15W02',96),
('Tablets','W03','FY14W03',42),
('Tablets','W03','FY15W03',113)
2. Add the custom code in the Report Properties.
Public Shared Value1 as Integer
Public Shared Value2 as Integer
Public Shared previous as string
Public Shared previousweek as string
Public Shared Function GetValue(Value as Integer,product as String,Week as String) as Integer
If Value=Nothing Then
Value=0
End If
If product =previous and Week =previousweek Then
Value2=Value
Else
previous=product
previousweek=Week
Value1=Value
End If
return Value
End Function
Public Shared Function GetPct()
If Value1=0 Then
return 0
Else
return (Value2-Value1)/Value1
End If
End Function
Public Shared Function GetDiff()
return Value2-Value1
End Function
3. Design the matrix like below.
4. Then get the expected results.<o:p></o:p>
If you have any question, please feel free to ask.
Best regards,
Qiuyun Yu
Qiuyun Yu
TechNet Community Support