Nonstandard user categories

SQL

SELECT page_id,
       CONCAT('[[', page_title, ']]') AS 'page title',
       CASE WHEN page_is_redirect = 0 THEN NULL
            ELSE (SELECT CASE WHEN rd_namespace = 0 THEN CONCAT('[[', rd_title, ']]')
                              ELSE CONCAT('[[{{ns:', rd_namespace, '}}:', rd_title, ']]')
                              END
                  FROM redirect
                  WHERE rd_from = page_id)
            END AS 'redirect to',
       EXISTS (SELECT 1 FROM categorylinks
               WHERE cl_from = page_id
               AND cl_to = 'All_redirects_for_discussion') AS 'is on WP:RFD'
FROM page
WHERE page_namespace = 0
  AND page_title RLIKE '^Q\\([0-9]+\\)';
SQL

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