mysql group by to return a the min value and get the corresponding row data

Question

I have a table of data like so :

- PK_table - merchantName - price - Product
- 1        - argos        - 7     - 4
- 2        - comet        - 3     - 4
- 1          


        

Answer 1

SELECT Merchant.Product, Merchant.Name, Merchant.Price
FROM a_table AS Merchant
JOIN
(
SELECT Product, MIN(Price) AS MinPrice
FROM a_table
GROUP BY Product
) AS Price
ON Merchant.Product = Price.Product
AND Merchant.Price = Price.MinPrice

Will return two rows if two merchants have the same low, low price.