SELECT count(DISTINCT customer_id) FROM customer_orders WHERE order_status  =  "Cancelled"
Return the number of customers who have at least one order with "Cancelled" status.
SELECT count ( DISTINCT customer_id ) FROM customer_orders WHERE order_status = `` Cancelled ''
select count ( distinct customer_id ) from customer_orders where order_status = value
Return the number of customers who have at least one order with `` Cancelled '' status .