ค่าสูงสุดของ Column ต่อ Group ใน MySQL

หา maximum ของ column ต่อ group ใน MySQL

SELECT colName1, MAX(colName2) FROM tableName GROUP BY colName1 ORDER BY colName1;

ตัวอย่าง PRODUCT Table

+---------+--------+
| Article | Price  |
+---------+--------+
| 1       | 255.50 |
| 1       | 256.05 |
| 2       | 90.50  |
| 3       | 120.50 |
| 3       | 123.10 |
| 3       | 122.10 |
+---------+--------+

Query

SELECT Article, MAX(Price) AS MaxPrice FROM Product GROUP BY Article ORDER BY Article;

Output

+--------------+--------------+
| Article      | MaxPrice     |
+--------------+--------------+
| 0001         | 256.05       |
| 0002         | 90.50        |
| 0003         | 123.10       |
+--------------+--------------+