CREATE TABLE products (Manufacturer VARCHAR2, name VARCHAR2)
CREATE TABLE manufacturers (name VARCHAR2, code VARCHAR2)

Find the name of companies that do not make 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'
SELECT "name" FROM "manufacturers" EXCEPT SELECT "T2"."name" FROM "products" "T1" JOIN "manufacturers" "T2" ON "T1"."Manufacturer" = "T2"."code" WHERE "T1"."name" = 'DVD drive'