What are the titles of films that are either longer than 100 minutes or rated PG other than those that cost more than 200 to replace?
SELECT title FROM film WHERE LENGTH  >  100 OR rating  =  'PG' EXCEPT SELECT title FROM film WHERE replacement_cost  >  200
titles of films longer than 100 minutes refers to LENGTH > 100; rated PG refers to rating = 'PG'; cost more than 200 to replace refers to replacement_cost > 200;