avg monthly edits before and after incubator graduation

SQL

WITH base_table AS (
  SELECT DISTINCT 
  	rev_id, rev_actor, rev_timestamp, rev_len, rev_parent_id,
  	page_namespace, page_id, actor_id
  FROM revision rev
  JOIN page ON rev.rev_page = page.page_id
  JOIN actor ON rev.rev_actor = actor.actor_id
  WHERE page_namespace IN (0, 1, 10, 11, 14, 15, 828, 829)
  ORDER BY rev_id DESC),
  
  edits_table AS (
  SELECT page_namespace, COUNT(DISTINCT rev_id) AS edit_count
  FROM base_table
  GROUP BY page_namespace),

  actor_table AS (
  SELECT page_namespace, COUNT(DISTINCT actor_id) AS actor_count
  FROM base_table
  GROUP BY page_namespace),

  page_table AS (
  SELECT page_namespace, COUNT(DISTINCT page_id) AS pages_count
  FROM base_table
  GROUP BY page_namespace),
  
  before_grad AS (
    SELECT *, YEAR(rev_timestamp) AS year, MONTH(rev_timestamp) AS month
    FROM base_table
    WHERE MONTH(rev_timestamp) < 8
    AND YEAR(rev_timestamp) < 2019),
    
  after_grad AS (
    SELECT *, YEAR(rev_timestamp) AS year, MONTH(rev_timestamp) AS month
    FROM base_table
    WHERE MONTH(rev_timestamp) >= 8
    AND YEAR(rev_timestamp) >= 2019),
  
  monthly_grouping_before_grad AS (
    SELECT page_namespace, month, 
    	MIN(rev_timestamp) AS first_edit,
    	COUNT(DISTINCT rev_id) AS edits_by_month_bg,
    	COUNT(DISTINCT actor_id) AS editors_by_month_bg
    FROM before_grad
    GROUP BY page_namespace, month, year),
    
  monthly_grouping_after_grad AS (
    SELECT page_namespace, month, 
    	COUNT(DISTINCT rev_id) AS edits_by_month_ag,
    	COUNT(DISTINCT actor_id) AS editors_by_month_ag
    FROM after_grad
    GROUP BY page_namespace, month, year),
    
  avg_table_before_grad AS (
    SELECT page_namespace, 
    	AVG(edits_by_month_bg) AS avg_monthly_edits_before_grad,
    	AVG(editors_by_month_bg) AS avg_monthly_editors_before_grad
    FROM monthly_grouping_before_grad
    GROUP BY page_namespace),
    
  avg_table_after_grad AS (
    SELECT page_namespace, 
    	AVG(edits_by_month_ag) AS avg_monthly_edits_after_grad,
    	AVG(editors_by_month_ag) AS avg_monthly_editors_after_grad
    FROM monthly_grouping_after_grad
    GROUP BY page_namespace)

SELECT e.page_namespace,  
		CAST(avg_monthly_editors_before_grad AS INT) AS avg_monthly_edits_before, 
		CAST(avg_monthly_editors_after_grad AS INT) AS avg_monthly_editors_after
FROM edits_table e
JOIN actor_table a ON a.page_namespace = e.page_namespace
JOIN avg_table_before_grad ON avg_table_before_grad.page_namespace = e.page_namespace
JOIN avg_table_after_grad ON avg_table_after_grad.page_namespace = e.page_namespace    
ORDER BY e.edit_count DESC
SQL

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