Show the product type codes which have at least two products.
CREATE TABLE products (product_type_code VARCHAR)
SELECT product_type_code FROM products GROUP BY product_type_code HAVING COUNT(*) >= 2
### Context: CREATE TABLE products (product_type_code VARCHAR) ### Question: Show the product type codes which have at least two products. ### Answer: SELECT product_type_code FROM products GROUP BY product_type_code HAVING COUNT(*) >= 2