环比主要流量来源报告？

[olivia]

WITH traffic_sources AS (
  SELECT
    EXTRACT(MONTH FROM user_visits.visited_at) AS month,
    incoming_referers.incoming_domain_id,
    COUNT(*) AS visit_count,
    LAG(COUNT(*)) OVER (PARTITION BY incoming_referers.incoming_domain_id ORDER BY EXTRACT(MONTH FROM user_visits.visited_at)) AS prev_month_visit_count
  FROM  user_visits 
  JOIN  incoming_referers	 
  ON	user_visits.user_id = incoming_referers.id
  WHERE user_visits.visited_at IS NOT NULL
  GROUP BY EXTRACT(MONTH FROM user_visits.visited_at), incoming_referers.incoming_domain_id
)
SELECT
  month,
  incoming_domain_id,
  visit_count,
  prev_month_visit_count,
  visit_count - COALESCE(prev_month_visit_count, 0) AS change
FROM traffic_sources
ORDER BY month, incoming_domain_id

嗨，我刚吃完晚饭回来，更新了查询；如果你有任何进展，请告诉我 。我的 discourse 服务器是新创建的，所以没有足够的数据进行查询，我在 SQL Server 中创建了一些虚拟数据，然后将其传输到了 PGSQL。