1: 分组，再选出每组最大值：
SELECT article, MAX(price) AS price
FROM shop
GROUP BY article
ORDER BY article;
+---------+-------+
| article | price | +
---------+-------+
| 0001 | 3.99 |
| 0002 | 10.99 |
| 0003 | 1.69 |
| 0004 | 19.95 |
+---------+-------+
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