Question: What are the names of customers who have purchased both products Latte and Americano?
SQL: SELECT t1.customer_name 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 JOIN products AS t4 ON t3.product_id  =  t4.product_id WHERE t4.product_details  =  'Latte' INTERSECT SELECT t1.customer_name 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 JOIN products AS t4 ON t3.product_id  =  t4.product_id WHERE t4.product_details  =  'Americano'