User pages for nonexistent users

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

SQL

SELECT COUNT(*)
FROM page
WHERE
  page_namespace IN (2,3)
  AND NOT EXISTS(
    SELECT 1
    FROM user
    WHERE REGEXP_REPLACE(user_name, ' ', '_') = REGEXP_REPLACE(page_title, '/.*', '')
  )

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SQL

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