Nested Query count ID if they're related - mysql

Question

I've got a project where I need to get the total number of directors and films.
It should be 6 directors and 12 films in total.
However, I have 8 directors and 12 films.
CREATE TABLE `director` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(255) NOT NULL,
PRIMARY KEY (`id`)
);
INSERT INTO `director` VALUES
(1,'Roman Polanski'),
(2,'George Lucas'),
(3,'Steven Spielberg'),
(4,'Sam Mendes'),
(5,'Sofia Coppola'),
(6,'Michael Bay'),
(7,'Justin Lin'),
(8,'Francis Coppola');
CREATE TABLE `film` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`title` varchar(255) NOT NULL,
`director_id` int(11) NOT NULL,
PRIMARY KEY (`id`)
);
INSERT INTO `film` VALUES
(1,'Saw',7),
(2,'Jaw',3),
(3,'The Pianist',1),
(4,'1917',4),
(5,'Fast and Furious',7),
(6,'Star Wars',2),
(7,'ET',3),
(8,'James bond',4),
(9,'Lost in Translation',5),
(10,'Close Encounter of the Third Kind',3),
(11,'Blood',4),
(12,'Somewhere',5);
And this is the query I used:
SELECT (
SELECT COUNT(*)
FROM director
) AS directors,
(
SELECT COUNT(*)
FROM film
) AS films
FROM dual
I'm wondering if there's a way to count the director id only if it's related to the film's id?

Answer 1

Just count the distinct director IDs in the film table:
select
count(*) as films,
count(distinct director_id) as directors
from film
There is no need to touch the director table at all. But as an exercise you could do the following:
select count(*) as directors
from director d
where exists (
select *
from film f
where f.director_id = d.id
)
Which will count directors who have ever directed a film.
See demo on db-fiddle.com