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)
CREATE TABLE stock (shop_id DECIMAL, device_id DECIMAL, quantity DECIMAL)

How many devices are there?
SELECT COUNT(*) FROM device
SELECT COUNT(*) FROM "device"