Number of A-class articles in English Wikipedia

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

Title says it all.

SQL

USE enwiki_p;
SELECT count(DISTINCT tp.page_id) FROM page tp
JOIN categorylinks
ON page_id=cl_from
JOIN page ap
ON (tp.page_title=ap.page_title
    AND ap.page_namespace=0)
WHERE tp.page_namespace=1
AND tp.page_is_redirect=0
AND ap.page_is_redirect=0
AND cl_to LIKE 'A-Class\_%\_articles';

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