CREATE TABLE products (code DECIMAL, name TEXT, price DECIMAL, manufacturer DECIMAL)
CREATE TABLE manufacturers (code DECIMAL, name TEXT, headquarter TEXT, founder TEXT, revenue DECIMAL)

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" AS "T1" JOIN "manufacturers" AS "T2" ON "T1"."manufacturer" = "T2"."code" WHERE "T1"."name" = 'DVD drive'