CREATE TABLE stock (shop_id DECIMAL, device_id DECIMAL, quantity DECIMAL)
CREATE TABLE shop (shop_id DECIMAL, shop_name TEXT, location TEXT, open_date TEXT, open_year DECIMAL)
CREATE TABLE device (device_id DECIMAL, device TEXT, carrier TEXT, package_version TEXT, applications TEXT, software_platform TEXT)

List the carriers of devices in ascending alphabetical order.
SELECT carrier FROM device ORDER BY carrier
SELECT "carrier" FROM "device" ORDER BY "carrier" NULLS FIRST