SELECT COUNT FROM SELECT DISTINCT cd cid as id cmp name FROM cities JO

SELECT
	*,COUNT(*)
FROM
	(

		SELECT
			DISTINCT cd.cid as id, cmp.`name`
		FROM
			cities c
		JOIN districts d ON (d.cid = c.id)
		JOIN city_delivery cd on (cd.district = d.id)
		JOIN companies cmp ON (cmp.id = cd.cid)
		WHERE
			c.id IN (9)
	) cm
JOIN comp_tags t ON (t.cid = cm.id)
WHERE
	t.tid IN (17,18,19)
GROUP BY t.cid
HAVING
	COUNT(t.tid) = 3