1 select
2   device_id,
3   yearmonth,
4   count(distinct user_id)
5 from transectionlog
6 inner join user u u.uid = transectionlog.user_id
7 where u.churned = 0
8 group by device_id, yearmonth
9 order by yearmonth desc
10
11 --- check to make sure we're not getting duplicated devices
12 select device_id
13 from transectionlog
14 group by device_id
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