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 |
+---------+----------+--------|

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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;

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输出

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

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上面的查询使用了相关子查询。

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