Sql 通过忽略属性进行分组

例如，我有以下表格：

itemgroup | description | price  
A, a, 10  
A, b, 12  
A, c, 14  
B, g, 11  
B, h, 16  

我想选择一组中价格最高的行，如下所示：

A, c, 14  
B, h, 16  

让我接近这一点的SQL查询（功能齐全）是：

SELECT itemgroup, MAX( price ) 
FROM table
GROUP BY itemgroup

通过尝试此操作，我得到一个“非表达式分组”-错误：

我需要这样的伪查询：

SELECT itemgroup, IGNORE( description), MAX( price ) 
FROM table
GROUP BY itemgroup

---

我希望我能解释一下我的小问题。

我通常会这样做：

SELECT t1.itemgroup, t1.description, t1.price
FROM table t1, 
    (SELECT itemgroup, MAX( price ) as price
     FROM table
     GROUP BY itemgroup) t2
WHERE t1.itemgroup = t2.itemgroup
AND t1.price = t2.price

---

使用分析函数：

SELECT itemgroup, description, price FROM 
    (select itemgroup, description, price, RANK() 
    OVER (PARTITION BY itemgroup ORDER BY max(price) DESC) as rank 
    FROM  group by itemgroup,description,price)a 
WHERE a.rank = 1
ORDER BY itemgroup;

---

分析函数非常强大，学习它们可以在很多情况下帮助您。

是的，我立即删除了它，谢谢您提供的信息！

SELECT t1.itemgroup, t1.description, t1.price
FROM table t1, 
    (SELECT itemgroup, MAX( price ) as price
     FROM table
     GROUP BY itemgroup) t2
WHERE t1.itemgroup = t2.itemgroup
AND t1.price = t2.price

SELECT itemgroup, description, price FROM 
    (select itemgroup, description, price, RANK() 
    OVER (PARTITION BY itemgroup ORDER BY max(price) DESC) as rank 
    FROM  group by itemgroup,description,price)a 
WHERE a.rank = 1
ORDER BY itemgroup;