Question: Find the number of distinct products Rodrick Heaney has bought so far.
SQL: SELECT count(DISTINCT 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"