Shin, thank you for an answer.
No, not really.
I would like a simple graph chart(like the one below) that for example which shows me how much of specific upgrades or downgrades happened per unit of time( in my full sample I will use per week, I think). I know that you cannot build good chart with the sample i provided but the problem is i cannot build any chart at all. I tried to build chart with my sample( second pic) with time one axis and count of chat_ids on another(basically count of chat ids is number of event in the sample) and filter out all upgrade cases but for some reason filter allows me to filter only one type of upgrades(even though there are more types of upgrades as you can see in the table)
Same happening with my full sample sadly
It requires VERY complicated table calculation which I cannot proceed.
Rather than that, you can have buffer data source.
Other than this, you need to use other ETL tool before Tableau connection.
Tiers_data_SM_18.1.twbx 50.3 KB