Group-wise Maximum of a Certain Column

Question

I\'ve got the table:

SELECT * FROM shop;

+---------+--------+------
| article | dealer | price
+---------+--------+------
|    0001 | A      |  3.45
|    00         


        

Answer 1

This does not work, because if you use group by, you can not use the individual fields of the original rows (except for the field you are grouping on). The correct way to do this, is to make an inner/nested query to select the dealer, suck as this (I haven't tested it, so it might be slightly off):

SELECT article, MAX(price) as maxPrice, (SELECT dealer FROM shop AS s2 WHERE s2.article = s1.article AND s2.price = maxPrice) AS expensiveDealer FROM shop AS s1 GROUP BY(article);