ga022.sql

WITH analytics_data AS (
  SELECT user_pseudo_id, event_timestamp, event_name, 
    app_info.version AS app_version,   -- This is new!
    UNIX_MICROS(TIMESTAMP("2018-09-01 00:00:00", "+8:00")) AS start_day,
    3600*1000*1000*24*7 AS one_week_micros
  FROM `firebase-public-project.analytics_153293282.events_*`
  WHERE _table_suffix BETWEEN '20180901' AND '20180930'
)

SELECT week_0_cohort / week_0_cohort AS week_0_pct,
 week_1_cohort / week_0_cohort AS week_1_pct,
 week_2_cohort / week_0_cohort AS week_2_pct,
 week_3_cohort / week_0_cohort AS week_3_pct
FROM (
  WITH week_3_users AS (
    SELECT DISTINCT user_pseudo_id
    FROM analytics_data
    WHERE event_timestamp BETWEEN start_day+(3*one_week_micros) AND start_day+(4*one_week_micros)
  ),
  week_2_users AS (
    SELECT DISTINCT user_pseudo_id
    FROM analytics_data
    WHERE event_timestamp BETWEEN start_day+(2*one_week_micros) AND start_day+(3*one_week_micros)
  ),
  week_1_users AS (
    SELECT DISTINCT user_pseudo_id
    FROM analytics_data
    WHERE event_timestamp BETWEEN start_day+(1*one_week_micros) AND start_day+(2*one_week_micros)
  ), 
  week_0_users AS (
    SELECT DISTINCT user_pseudo_id
    FROM analytics_data
    WHERE event_name = 'first_open'
      AND app_version = "2.62"   -- This bit is new, too!
      AND event_timestamp BETWEEN start_day AND start_day+(1*one_week_micros)
  )
  SELECT 
    (SELECT count(*) 
     FROM week_0_users) AS week_0_cohort,
    (SELECT count(*) 
     FROM week_1_users 
     JOIN week_0_users USING (user_pseudo_id)) AS week_1_cohort,
    (SELECT count(*) 
     FROM week_2_users 
     JOIN week_0_users USING (user_pseudo_id)) AS week_2_cohort,
    (SELECT count(*) 
     FROM week_3_users 
     JOIN week_0_users USING (user_pseudo_id)) AS week_3_cohort
)