SELECT DISTINCT

  actor_name,

  rc_this_oldid,

  comment_text

FROM

  recentchanges_userindex AS recentchanges

  INNER JOIN comment ON recentchanges.rc_comment_id = comment.comment_id

  INNER JOIN actor_recentchanges AS actor ON recentchanges.rc_actor = actor.actor_id

WHERE

  rc_namespace = 0

  AND rc_bot = 0

  AND actor_name IS NOT NULL

  AND comment_text RLIKE '%[sS]entence correction%'

ORDER BY rc_timestamp DESC;