rake task で次のクエリを実行するにはどうすればよいですか?
DELETE FROM crawled_categories WHERE id NOT IN (
SELECT id FROM (
SELECT DISTINCT(site_id, parent_category, breadcrumb), max(id) AS id
FROM crawled_categories
WHERE map_id is null
GROUP BY site_id, parent_category, breadcrumb
) AS tmp
) AND map_id IS NULL