Test 2 - Quarry

SQL

USE ckbwiki_p;

SELECT
 CONCAT(month, '/', year) monthly,
 SUM(period < 7) less_than_1week,
 SUM(period BETWEEN 7 AND 30) 1week_to_1month,
 SUM(period BETWEEN 31 AND 365) 1month_to_1year,
 SUM(period > 365) more_than_1year
 FROM (
  SELECT
   SUBSTR(first, 5, 2) month,
   SUBSTR(first, 1, 4) year,
   TIMESTAMPDIFF(DAY, first, last) period
   FROM (
    SELECT
     MIN(rev_timestamp) first,
     MAX(rev_timestamp) last
     FROM revision_userindex
     WHERE rev_user != 0 AND rev_user NOT IN (SELECT ug_user FROM user_groups WHERE ug_group = 'bot')
     GROUP BY rev_user
   ) a
 ) b
 GROUP BY monthly
 ORDER BY year, month;
SQL

Checking query status...
