What are the names of the cameras that have taken picture of the most mountains?
create table camera_lens (name varchar, id varchar, PRIMARY KEY (name)); create table photos (camera_lens_id varchar, PRIMARY KEY (camera_lens_id))
select t2.name from photos as t1 join camera_lens as t2 on t1.camera_lens_id = t2.id group by t2.id order by count(*) desc limit 1