Ownerless pages in the user and user talk space on zhwikibooks

This query is marked as a draft This query has been published by WhitePhosphorus.

SQL

USE zhwiki_p;
SET @ip_regex = "(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)";
SELECT page_namespace, page_title
FROM page
LEFT JOIN user ON
  IF(INSTR(page_title, '/'),
     MID(page_title, 1, INSTR(page_title, '/')-1),
     page_title) = REPLACE(user_name, ' ', '_')
WHERE
  page_namespace IN (2, 3) AND
  page_is_redirect = 0 AND
  page_title NOT RLIKE @ip_regex AND
  user_name IS NULL

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