Incubator users (no of "wikis" edited)

SQL

WITH 
	base_table AS (
      SELECT DISTINCT 
      REGEXP_SUBSTR(page_title, 'W[a-z]/[a-z]+') AS prefix ,
      rev_id, 
        user_name,
        rev_timestamp
      FROM 
        revision rev
      JOIN 
        page p
        ON rev.rev_page = p.page_id
      JOIN 
        actor a
        ON rev.rev_actor = a.actor_id
      JOIN
      	user u
      	ON a.actor_user = u.user_id
      LEFT JOIN
      	user_groups ug
	
      WHERE 
        page_namespace IN (0, 1, 10, 11, 14, 15, 828, 829) AND
      	ug_group NOT IN ("bot") AND
      MONTH(rev_timestamp) = MONTH(NOW()) - 1 AND
      YEAR(rev_timestamp) = YEAR(NOW())
      HAVING 
        prefix <> ''),
   
   g1 AS (
     SELECT
     	user_name,
     	prefix,
     COUNT(rev_id) AS edit_count
     FROM base_table
    
     GROUP BY prefix, user_name
     -- HAVING COUNT(rev_id) >=5
   ),
   
   g2 AS (
     SELECT
     	user_name,
     COUNT(prefix) AS languages_edited
     FROM g1
     GROUP BY user_name)
     

SELECT *
FROM g2
ORDER BY user_name
SQL

Checking query status...
