adh005.sql

WITH impression_stats AS (
  SELECT
    event.country_domain_name AS country,
    CONCAT(event.country_domain_name, '-', event.state) AS state,
    COUNT(DISTINCT user_id) AS users,
    COUNT(*) AS impressions
  FROM adh.cm_dt_impressions
  WHERE event.country_domain_name = 'US'
    OR event.country_domain_name = 'CA'
  GROUP BY 1, 2
)
SELECT
  country,
  IFNULL(state_name, state) AS state_name,
  users,
  impressions,
  FORMAT(
    '%0.2f',
    IF(
      IFNULL(impressions, 0) = 0,
      0,
      impressions / users
    )
  ) AS avg_imps_per_user
FROM impression_stats
LEFT JOIN adh.cm_dt_state USING (state)
;