Hi ,
The point I mentioned has still not been clarified.
Given that you have 3 months of data , do you want the number of users from each team who visited in January and February , or February and March , or January and March ?
Let us take specific examples rather than discuss generalities. I am ignoring the criterion of teams and we can assume that all of the mentioned users are from the same team , but the principle will remain the same.
Suppose the users in January were A , C , D , F.
Suppose the users in February were B , C , D , F , G.
Suppose the users in March were A , B , C , D , F , G.
What would be the result that you would be looking for ?
Suppose the users in March were B , D , F ; what would be the result you are looking for ?
Narayan