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

Find the name of product that is produced by both companies Creative Labs and Sony.
SELECT T1.name FROM products AS T1 JOIN manufacturers AS T2 ON T1.Manufacturer = T2.code WHERE T2.name = 'Creative Labs' INTERSECT SELECT T1.name FROM products AS T1 JOIN manufacturers AS T2 ON T1.Manufacturer = T2.code WHERE T2.name = 'Sony'
SELECT "T1"."name" FROM "products" "T1" JOIN "manufacturers" "T2" ON "T1"."Manufacturer" = "T2"."code" AND "T2"."name" = 'Creative Labs' INTERSECT SELECT "T1"."name" FROM "products" "T1" JOIN "manufacturers" "T2" ON "T1"."Manufacturer" = "T2"."code" AND "T2"."name" = 'Sony'