what is the name of the product with the characteristic "hot"?
SELECT t1.product_name FROM products AS t1 JOIN product_characteristics AS t2 ON t1.product_id   =   t2.product_id JOIN CHARACTERISTICS AS t3 ON t2.characteristic_id   =   t3.characteristic_id WHERE t3.characteristic_name   =   "hot"
product with the characteristic 'hot' refers to joining tables products, product_characteristics, and characteristics to filter where characteristic_name = 'hot';