Firebase -> BigQuery how to get active users for that month, week, day

Question

I have absolutely no idea where to start on this, I've already searched google for information and came up with nothing. I have many apps from Firebase feeding into BigQuery. I want to be able to get the active users for that month from bigquery. There has got to be a way that you can simply do this. Any help would be great. Thanks.

Answer 1

It should be possible to count the number of distinct fullVisitorId, grouped by month:

#standardSQL
SELECT
  EXTRACT(MONTH FROM
      TIMESTAMP_MICROS(user_dim.first_open_timestamp_micros)) AS month,
  COUNT(DISTINCT user_dim.app_info.app_instance_id) AS monthly_visitors
FROM `your_dataset.your_table`
GROUP BY month;

(Note that this groups January of this year with January of last year, however). You could alternatively group by year + month:

#standardSQL
SELECT
  FORMAT_TIMESTAMP(
      '%Y-%m',
      TIMESTAMP_MICROS(user_dim.first_open_timestamp_micros)) AS year_and_month,
  COUNT(DISTINCT user_dim.app_info.app_instance_id) AS monthly_visitors
FROM `your_dataset.ga_sessions`
GROUP BY year_and_month;