Parenthetically disambiguated titles without primary page

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

SQL

select
  page1.page_title as page_title,
  regexp_replace(page1.page_title, '_\(.*?\)$', '') as ambiguous_title
from
  page page1
  left join page page2 on page1.page_namespace = page2.page_namespace
  and regexp_replace(page1.page_title, '_\(.*?\)$', '') = page2.page_title
where
  page1.page_namespace = 0
  and page1.page_title like '%_(%)' escape '`'
  and page1.page_is_redirect = 0
  and page2.page_id is null;

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