Rodrick Heaney ซื้อผลิตภัณฑ์ทั้งหมดกี่ประเภท?ไม่จำเป็นต้องใช้โต๊ะทั้งหมด
How many types of products have Rodrick Heaney bought in total?It is not neccessary to use all the tables.
 customers:  (customer_id [ VARCHAR ] customer_name [ VARCHAR) ]
SELECT COUNT(DISTINCT t3.product_id) FROM customers AS t1 JOIN customer_orders AS t2 ON t1.customer_id = t2.customer_id JOIN order_items AS t3 ON t2.order_id = t3.order_id WHERE t1.customer_name = "Rodrick Heaney"