Combine seperate lookupsets - find max(), count()?

Question

Hello, my knowledge of SSRS is intermediate.  Enough to have a plan.  But I need just a little assistance.
Here are the functions.
here are my three lookupsets:
-LookupSet(Fields!name.Value, Fields!name.Value, Fields!act_actualend.Value, “AccountActivities”)
-LookupSet(Fields!name.Value, Fields!name.Value, Fields!act_actualend.Value, “AccountContactActivities”)
-LookupSet(Fields!name.Value, Fields!name.Value, Fields!act_actualend.Value, “AccountOpportunityActivities”)
1) How could I find the 'Max()' of all three of these datasets.  The single highest number.
2) How could I find the 'COUNT()' of all three of these datasets.   The total number of rows.
If they can be done separately and then added together using variables, that is an acceptable solution.  Still, I'm just learning syntax here.
THanks

Answer 1

Hi ebs_software,
According to your description, you used three lookupset function to retrieve data from other dataset, now you want to select max value and count of values of all three datasets.
I tested the issue in my local machine, we could not select sum and max value returned by lookupset function directly. To workaround this issue, we need to use custom code. For detail information, please refer to the following document:
  1. Right-click outside of the report, click Report Properties.
  2. Click Code in left pane, type the code like below:
Public Function AggLookup(ByVal choice as String, ByVal items as Object)
If items is Nothing then
Return Nothing
End If
Dim current as Decimal
Dim sum as Decimal
Dim count as Integer
Dim min as Decimal
Dim max as Decimal
Dim err as String
current = 0
sum = 0
count = 0
err = ""
For each item as Object in items
'Calculate count
count += 1
'Check value is a number
If IsNumeric(item) then
'Set current
current = Convert.ToDecimal(item)
'Calculate sum
sum += current
'Calculate min
If min = Nothing then
min = current
End If
If Min >current then
min = current
End If
'Calculate max
If max = Nothing then
max = current
End If
If max < current then
max = current
End If
'Return NaN if value is not a number
Else
err = "NaN"
End If
Next
'Select and set output based on the user choice or choice passed by function
If err = "NaN" then
If choice = "count" then
Return count
Else
Return err
End If
Else
Select Case choice
Case "sum"
Return sum
Case "count"
Return count
Case "min"
Return min
Case "max"
Return max
Case "avg"
'Calculate the average avoiding divide by zero errors
If count > 0 then
Return sum / count
Else
Return 0
End If
End Select
End If
End Function
  3. Right-click handle of the column you want to count values returned by lookupset function, click Expression.
  4. In Expression text box, type the expression like below:
=LookupSet(Fields!name.Value, Fields!name.Value, Fields!act_actualend.Value,"AccountActivities").Length + LookupSet(Fields!name.Value, Fields!name.Value, Fields!act_actualend.Value,"AccountContactActivities").Length + LookupSet(Fields!name.Value, Fields!name.Value, Fields!act_actualend.Value,"AccountOpportunityActivities").Length
  5. Right-click handle of the column you want to calculate total of values returned by lookupset function, click Expression.
  6. In Expression text box, type the expression like below:
=Code.AggLookup("sum",LookupSet(Fields!name.Value, Fields!name.Value, Fields!act_actualend.Value,"AccountActivities"))
  7. Right-click handle of the column you want to select max value returned by lookupset function, click Expression.
  8. In Expression text box, type the expression like below:
=Code.AggLookup("max",LookupSet(Fields!name.Value, Fields!name.Value, Fields!act_actualend.Value,"AccountActivities"))
The following screenshot is for your reference:
If you have any more questions, please feel free to ask.
Thanks,
Wendy Fu
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