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SQL

AخA
 
SELECT r1.rev_id,
       r1.rev_timestamp,
       actor_name,
       page_namespace, page_title,
       r1.rev_len - COALESCE(r2.rev_len, 0) AS delta,
       comment_text
FROM revision AS r1
JOIN comment_revision ON comment_id = r1.rev_comment_id
JOIN actor_revision ON actor_id = r1.rev_actor
JOIN page ON page_id = r1.rev_page
LEFT JOIN revision AS r2 ON r2.rev_id = r1.rev_parent_id
WHERE r1.rev_id IN
(
  SELECT rev_id
  FROM revision
  JOIN comment_revision ON comment_id = rev_comment_id
  WHERE comment_text LIKE '%ReferenceExpander%'
    AND rev_timestamp BETWEEN '2020' AND '2021' -- any range longer than about a year does a full table scan
  UNION
  SELECT rev_id
  FROM revision
  JOIN comment_revision ON comment_id = rev_comment_id
  WHERE comment_text LIKE '%ReferenceExpander%'
    AND rev_timestamp BETWEEN '2021' AND '2022'
  UNION
  SELECT rev_id
  FROM revision
  JOIN comment_revision ON comment_id = rev_comment_id
  WHERE comment_text LIKE '%ReferenceExpander%'
    AND rev_timestamp BETWEEN '2022' AND '2023'
  UNION
  SELECT rev_id
  FROM revision
  JOIN comment_revision ON comment_id = rev_comment_id
  WHERE comment_text LIKE '%ReferenceExpander%'
    AND rev_timestamp >= '2023'
  )
ORDER BY r1.rev_len - COALESCE(r2.rev_len, 0) ASC;
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