Cohort Tables with BigQuery and Grafana

cohort-table-with-bigquery-and-grafana-example.sql

#standardSQL
WITH
  pages AS (
  SELECT
    anonymous_id,
    SAFE_CAST(sent_at AS timestamp) AS sent_at,
    context_page_path,
    ROW_NUMBER() OVER (PARTITION BY anonymous_id ORDER BY sent_at ASC) AS row_num
  FROM
    `table-name-redacted`
  WHERE
    context_page_path LIKE '/blog/%'
    AND user_id != 'undefined' ),
  cohort AS (
  SELECT
    pages.anonymous_id,
    TIMESTAMP_TRUNC(sent_at, week) AS weekly_cohort
  FROM
    pages
  WHERE
    pages.row_num = 1 ),
  absolute_counts AS (
  SELECT
    cohort.weekly_cohort AS weekly_cohort,
    COUNT(DISTINCT
      CASE
        WHEN row_num = 1 THEN pages.anonymous_id
    END
      ) AS total_unique_visitors,
    COUNT(DISTINCT
      CASE
        WHEN row_num = 2 THEN pages.anonymous_id
    END
      ) AS at_least_2_pageviews,
    COUNT(DISTINCT
      CASE
        WHEN row_num = 3 THEN pages.anonymous_id
    END
      ) AS at_least_3_pageviews,
    COUNT(DISTINCT
      CASE
        WHEN row_num = 4 THEN pages.anonymous_id
    END
      ) AS at_least_4_pageviews,
    COUNT(DISTINCT
      CASE
        WHEN row_num = 5 THEN pages.anonymous_id
    END
      ) AS at_least_5_pageviews,
    COUNT(DISTINCT
      CASE
        WHEN row_num > 5 THEN pages.anonymous_id
    END
      ) AS more_than_5_pageviews
  FROM
    cohort
  INNER JOIN
    pages
  ON
    cohort.anonymous_id = pages.anonymous_id
  GROUP BY
    1
  ORDER BY
    1 )
SELECT
  weekly_cohort,
  total_unique_visitors,
  ROUND(at_least_2_pageviews/total_unique_visitors, 3) AS at_least_2_pageviews,
  ROUND(at_least_3_pageviews/total_unique_visitors, 3) AS at_least_3_pageviews,
  ROUND(at_least_4_pageviews/total_unique_visitors, 3) AS at_least_4_pageviews,
  ROUND(at_least_5_pageviews/total_unique_visitors, 3) AS at_least_5_pageviews,
  ROUND(more_than_5_pageviews/total_unique_visitors, 3) AS more_than_5_pageviews
FROM
  absolute_counts