SELECT code ,  name ,  min(price) FROM products GROUP BY name
What are the codes and names of the cheapest products in each category?
[Schema (values) (types)]: | manufactory_1 |  Manufacturers : code (text) , name (number) , headquarter (text) , founder (text) , revenue (text) | Products : code (text) , name (number) , price (text) , manufacturer (text);