Identify the name and product category for the most expensive and the least expensive products.
name of product refers to ProductName; category of product refers to CategoryName; the most expensive products refers to MAX(UnitPrice); the least expensive products refers to MIN(UnitPrice);
SELECT T2.ProductName, T1.CategoryName FROM Categories AS T1 INNER JOIN Products AS T2 ON T1.CategoryID = T2.CategoryID WHERE T2.UnitPrice IN (( SELECT MIN(UnitPrice) FROM Products ), ( SELECT MAX(UnitPrice) FROM Products ))