CREATE TABLE products (code NUMBER, name CLOB, price NUMBER, manufacturer NUMBER)
CREATE TABLE manufacturers (code NUMBER, name CLOB, headquarter CLOB, founder CLOB, revenue NUMBER)

What are the names of companies that do not make DVD drives?
SELECT name FROM manufacturers EXCEPT SELECT T2.name FROM products AS T1 JOIN manufacturers AS T2 ON T1.manufacturer = T2.code WHERE T1.name = 'DVD drive'
SELECT "name" FROM "manufacturers" EXCEPT SELECT "T2"."name" FROM "products" "T1" JOIN "manufacturers" "T2" ON "T1"."manufacturer" = "T2"."code" WHERE "T1"."name" = 'DVD drive'