You're still not explaining the basis. To me, it looks like you're counting the FIRST Category ID from each Transaction, but there is no logic to their order - they're not in Alphabetical order, otherwise CMP would come before Collections for Transaction 8000000009.
If you don't explain the reasons behind your requirement, people are going to waste their time and yours suggesting mechanisms that may not be appropriate. Please save us all a lot of time and effort by clearly stating your requirements, with examples and how they are derived.