How to make a “distinct” join with MySQL

Question

I have two MySQL tables (product and price history) that I would like to join:

Product table:

Id = int
Name = varchar
Manufacturer = varchar         


        

Answer 1

SELECT Product.UPC, Product.Name, Price_h.Price, Price_h.Date
FROM Product
LEFT JOIN Price_h
ON (Product.Id = Price_h.Product_id AND Price_h.Date = 
  (SELECT MAX(Date) FROM Price_h ph1 WHERE ph1.Product_id = Product.Id));