Compare each top editor's total edits against the overall average

SQL

# sub query for calculation of average edits
SET @avg_edits = (SELECT AVG(total_edits) FROM(
  SELECT COUNT(r.rev_id) AS total_edits 
  FROM 
	 revision AS r
  WHERE r.rev_timestamp BETWEEN
  	DATE_FORMAT(CURDATE()- INTERVAL 2 MONTH,'%Y%m01') 
  		AND
  	DATE_FORMAT(CURDATE(),'%Y%m%d')
  GROUP BY 
  		r.rev_actor
  
) AS subquery);
# main query
SELECT 
	a.actor_name,
    COUNT(r.rev_id) AS total_count,
    ROUND(((COUNT(r.rev_id) - @avg_edits) / @avg_edits),2) as percentage_above_Average 
FROM
 	actor AS a 
JOIN revision AS r ON 
    a.actor_id = r.rev_actor
WHERE
    r.rev_timestamp 
BETWEEN
        DATE_FORMAT(CURDATE() - INTERVAL 2 MONTH, '%Y%m01') 
     AND 
        DATE_FORMAT(CURDATE(), '%Y%m%d')
GROUP BY
	r.rev_actor 
order by 
	total_count 
desc limit 5;

SQL

Checking query status...