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SQL

AخA
 
USE enwiki_p;
SELECT COUNT(*)
FROM (
SELECT unspaced_page_title, COUNT(page_title) AS child_titles
FROM (
  SELECT
    page_title,
    REPLACE(page_title, "_", "") AS unspaced_page_title
  FROM page
  WHERE
    page_namespace = 10
    AND LOCATE("_", page_title)
  LIMIT 100000
) AS subquery1
GROUP BY unspaced_page_title
) AS subquery2
WHERE child_titles > 1
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