SELECT rc_user_text AS user, 

       Count(rc_id)                          AS cnt, 

       Count(rc_id) / 15                     AS EPM, 

       max(rc_timestamp)                          AS last_change,

       comment_text                                                       AS      last_editsum

FROM   recentchanges_userindex

join comment on rc_comment_id = comment_id

WHERE  rc_timestamp >= Date_sub(Now(), INTERVAL 15 minute) 

       AND rc_bot != 1 

       AND ( rc_type = 0 

              OR rc_type = 1 )  

GROUP  BY rc_user_text 

HAVING EPM > 1

ORDER  BY cnt DESC;