Use eswiki_p;

    SELECT ns_name, page_title

    FROM page AS pg1

        AND pg1.page_namespace = ns_id

    JOIN templatelinks AS tl

        ON pg1.page_id = tl.tl_from

    WHERE pg1.page_namespace = 14

        AND tl.tl_namespace = 10

        AND tl.tl_title = 'Wikiviajes_por_Venezuela_2014'

        AND EXISTS (SELECT 1

            FROM page AS pg2

            JOIN categorylinks AS cl

            ON pg2.page_id = cl.cl_from

            WHERE pg2.page_namespace = 0

            AND pg1.page_title = cl.cl_to);