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SELECT CONCAT('Category:', cl.cl_to) AS category_link, -- Формируем ссылку на категорию COUNT(cl.cl_from) AS article_count -- Подсчитываем количество статей в категории FROM categorylinks cl LEFT JOIN page p ON p.page_title = cl.cl_to AND p.page_namespace = 14 WHERE p.page_id IS NULL -- Категория не существует GROUP BY cl.cl_to HAVING article_count > 0 -- Категория должна использоваться ORDER BY article_count DESC; -- Сортируем по количеству статей
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