MySQL 中保存某一列的分组最大值的行

SELECT colName1, colName2, colName3 FROM tableName s1 WHERE colName3=(SELECT MAX(s2. colName3) FROM tableName s2 WHERE s1. colName1= s2. colName1) ORDER BY colName1;

假设我们有以下产品表 -

+---------+----------+--------+
| Article | Warehouse| Price  |
+---------+----------+--------+
| 1       | North    | 255.50 |
| 1       | North    | 256.05 |
| 2       | South    | 90.50  |
| 3       | East     | 120.50 |
| 3       | East     | 123.10 |
| 3       | East     | 122.10 |
+---------+----------+--------|

以下是查询 −

查询

SELECT Article, Warehouse, Price
FROM Product p1
WHERE Price=(SELECT MAX(p2. Price)
FROM Product p2
WHERE p1. Article= p2. Article)
ORDER BY Article;

输出

+-------------+----------------+------------+
| Article     | Warehouse      | Price      |
+-------------+----------------+------------+
| 0001        | North          | 256.05     |
| 0002        | South          | 90.50      |
| 0003        | East           | 123.10     |
+-------------+----------------+------------+

上面的查询使用了相关子查询。

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