Question

如果我的表格中包含pid, sid列作为主键，price和color。

如何创建一个SQL查询，可以获取pid（{1}}等于color的每个green（产品ID）最便宜的价格？

例如我有行：

(1, 1, 10, "green")
(1, 2, 8, "green")
(1, 3, 11, "green")
(2, 1, 7, "green")
(2, 2, 15, "green")
(2, 3, 22, "green")
(3, 1, 10, "red")
(1, 2, 8, "red")
(1, 3, 11, "red")

然后我会收到：(1, 2, 8)->pid=1和(2, 1, 7)->pid=2。没有pid=3，因为它的颜色为红色。

提前致谢。

Answer 1

SELECT pid, min(Price)
from table
Where Color='green'
group by pid

或者如果你想要整行（并且你的sql平台支持排名）......

select * 
from
(
 select *, ROW_NUMBER() over (partition by pid order by price) rn
 from #t
 where color='green'
) v
where rn=1

Answer 2

试试这个，

SELECT  a.*
FROM    tableName a
            INNER JOIN
            (
                SELECT pid, min(price) minPrice
                FROM    tableName b
            ) c ON a.pid = c.pid AND
                    a.price = c.minprice
WHERE   a.color = 'green'

组查询和前n条记录SQL

2 个答案: