Un altro che non posso rivendicare come mio – preso direttamente dalla dashboard di DC 
I 10 principali referenti nell’ultimo mese
SELECT COUNT(*) AS count_all, incoming_domains.name
AS incoming_domains_name
FROM "incoming_links"
INNER JOIN "posts" ON "posts"."id" = "incoming_links"."post_id"
AND ("posts"."deleted_at" IS NULL)
INNER JOIN "topics" ON "topics"."id" = "posts"."topic_id"
AND ("topics"."deleted_at" IS NULL)
INNER JOIN "incoming_referers" ON "incoming_referers"."id" = "incoming_links"."incoming_referer_id"
INNER JOIN "incoming_domains" ON "incoming_domains"."id" = "incoming_referers"."incoming_domain_id"
WHERE (topics.archetype = 'regular')
AND ("topics"."deleted_at" IS NULL)
AND (incoming_links.created_at > date_trunc('month', CURRENT_DATE) - INTERVAL '30 days'
AND incoming_links.created_at < date_trunc('month', CURRENT_DATE))
GROUP BY incoming_domains.name
ORDER BY count_all DESC LIMIT 10