Find all the films longer than 100 minutes, or rated PG, except those who cost more than 200 for replacement. List the titles.
SELECT title FROM film WHERE LENGTH  >  100 OR rating  =  'PG' EXCEPT SELECT title FROM film WHERE replacement_cost  >  200
films longer than 100 minutes refers to LENGTH > 100; rated PG refers to rating = 'PG'; cost more than 200 for replacement refers to replacement_cost > 200; list the titles refers to SELECT title;