Hi,
I have a question for you.
If I have a flat table in mysql, which has tens of million of rows,
userId, eventId, detection_time, score
1, 1, 2018-01-01 00:01:00, 0.1
1, 1, 2018-01-01 00:05:00, 0.1
1, 2, 2018-01-01 00:01:00, 0.1
1, 3, 2018-01-01 00...