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 customer_orders (customer_id VARCHAR, order_status VARCHAR)
### Question:
How many customers have at least one order with status "Cancelled"?
### Answer:
SELECT COUNT(DISTINCT customer_id) FROM customer_orders WHERE order_status = "Cancelled"