Untitled query #87030

This query is marked as a draft This query has been published by Enhancing999.

pairs of categories that contain each other (parent category = subcategory)

SQL

# based on https://en.wikipedia.org/wiki/Wikipedia:Database_reports/Self-categorized_categories/Configuration
SELECT
  page_title
FROM 
 page as p1, 
 page as p2, 
 categorylinks as cl1, 
 categorylinks as cl2
WHERE 
cl1.cl_to = p1.page_title 
AND p1.page_id = cl2.cl_from
AND p1.page_namespace = 14
AND cl2.cat_title = p2.page_title
AND p2.page_namespace = 14
AND p1.page_id = cl1.cl_from
AND p1.page_id < p2.page_id;

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