3.6.3.列的最大值：按組
3.6.3. 列的最大值：按組
任務：每項物品的的最高價格是多少？
SELECT article, MAX(price) AS price FROM shop GROUP BY article +---------+-------+ | article | price | +---------+-------+ | 0001 | 3.99 | | 0002 | 10.99 | | 0003 | 1.69 | | 0004 | 19.95 | +---------+-------+