2020 Olympics pages w/o 2021 redirects

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

Non-redirect pages in the main namespace with titles containing any of "2020 Olympics", "2020 Summer Olympics", "2020 Paralympics", "2020 Summer Paralympics", or "Tokyo 2020" (case-insensitive); where there isn't a redirect pointing at them, with the same title except "2021" instead of "2020".

For [[WP:VPT#Missing "2021 Olympics" redirects]] circa 25 Jul 2021.

SQL

SELECT page_title
FROM page AS p1
WHERE p1.page_namespace = 0
  AND p1.page_title RLIKE '(?i)(2020_(Summer_)?(O|Para)lympics|Tokyo_2020)'
  AND p1.page_is_redirect = 0
  AND NOT EXISTS (SELECT 1 FROM redirect
                  JOIN page AS p2 ON p2.page_id = rd_from
                  WHERE rd_namespace = 0
                    AND rd_title = p1.page_title
                    AND p2.page_namespace = 0
                    AND p2.page_namespace = REPLACE(p1.page_title, '2020', '2021'));

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