#1242 - Subquery returns more than 1 row - mysql

Question

I am trying to make a select statement that selects the image names from a MySQL database. The table is called - pictures_archive. I am also trying to select these pictures

Answer 1

SELECT p.pictures_archive_filename FROM 
pictures_archive p inner join pictures_archive_category pc 
on p.pictures_archive_id = pc.pictures_archive_id 
where pc.pictures_category_id=9