Table schema:
CREATE TABLE products (product_name VARCHAR, product_id VARCHAR); CREATE TABLE customer_orders (order_id VARCHAR, customer_id VARCHAR); CREATE TABLE order_items (order_id VARCHAR, product_id VARCHAR)

Question: Find the names of products that were bought by at least two distinct customers.
SQL: SELECT DISTINCT T3.product_name FROM customer_orders AS T1 JOIN order_items AS T2 ON T1.order_id = T2.order_id JOIN products AS T3 ON T2.product_id = T3.product_id GROUP BY T3.product_id HAVING COUNT(DISTINCT T1.customer_id) >= 2