SQL. I'm stuck with this sql query
<p><code>select SUM(category)
from film_list
where title IN actors;</code></p>

<p>I'm stuck, I'm working on the sakila database and I'm trying to figure out  film categories in which there are between 55 and 65 films. Return the names of these
categories and the number of films per category, sorted by the number of films.Pls any ideas?</p>