Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE suppliers (customer_phone VARCHAR, supplier_phone VARCHAR); CREATE TABLE customers (customer_phone VARCHAR, supplier_phone VARCHAR)
### Question:
What are the phone numbers of all customers and suppliers.
### Answer:
SELECT customer_phone FROM customers UNION SELECT supplier_phone FROM suppliers