Autoren nach Land, Geschlecht und Geb.Jahrzehnt

SQL

WITH RECURSIVE Cat AS (SELECT page_title, page_id
                        FROM page
                       WHERE page_title = 'Autor'
                         AND page_namespace = 14
                       UNION
                      SELECT SubCat.page_title, SubCat.page_id
                        FROM page AS SubCat, categorylinks, Cat
                       WHERE SubCat.page_namespace = 14
                         AND cl_from = SubCat.page_id
                         AND cl_to = Cat.page_title
                         AND cl_type = "subcat"
                     )
SELECT COUNT(*) as Anzahl, Geschl.cl_to AS Geschlecht, CONCAT(SUBSTRING(Geb.cl_to, 9, 3), '0') AS Geburtsjahrzehnt, Land.cl_to AS Land
  FROM page AS P, categorylinks AS Geschl, categorylinks AS Geb, categorylinks AS Land
 WHERE EXISTS (SELECT 1
                     FROM categorylinks AS Autoren, Cat
                    WHERE Autoren.cl_from = P.page_id
                      AND Autoren.cl_to = Cat.page_title
                   )
   AND Geschl.cl_from = P.page_id
   AND Geschl.cl_to IN ('Mann', 'Frau', 'Nichtbinäre_Person', 'Geschlecht_unbekannt')
   AND Geb.cl_from = P.page_id
   AND Geb.cl_to LIKE "Geboren\_____"
   AND Land.cl_from = P.page_id
   AND Land.cl_to IN ('Deutscher', 'Österreicher', 'Schweizer', 'Lichtensteiner')
 GROUP BY Geschlecht, Geburtsjahrzehnt, Land
SQL

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