SQL
AخA
USE enwiki_p;
SELECT /* SLOW_OK */ cl_to
FROM categorylinks
WHERE
cl_from IN
(SELECT DISTINCT ll_from
FROM langlinks
WHERE ll_lang = "fa" )
AND
cl_to NOT IN
(SELECT DISTINCT page_title
FROM langlinks LEFT JOIN page
ON page_id = ll_from
WHERE ll_lang = "fa"
AND page_namespace = 14)
GROUP BY cl_to;
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