cohort7.sql

WITH analytics_data AS (
  SELECT user_pseudo_id, event_timestamp, event_name, 
    UNIX_MICROS(TIMESTAMP("2018-08-01 00:00:00", "-7:00")) AS start_day,
    3600*1000*1000*24*7 AS one_week_micros
  FROM `firebase-public-project.analytics_153293282.events_*`
  WHERE _table_suffix BETWEEN '20180731' AND '20180829'
)
SELECT DISTINCT user_pseudo_id
FROM analytics_data
WHERE event_name = 'first_open'
  AND event_timestamp BETWEEN start_day AND start_day+(1*one_week_micros)