我创建了一个类似于此的表，方法是创建几个临时表并将它们连接到我的数据库中：
customerid Segment Sales Country
1 1 $3 US
2 2 $4 CAN
3 3 $5 US
4 5 $6 CAN
5 4 $5 US
6 6 $1 CAN
7 7 $4 US
8 3 $2 CAN
9 2 $2 US
10 1 $1 CAN
11 9 $5 US
12 10 $2 CAN
13 1 $4 US
14 3 $2 CAN
15 4 $1 US
我想要实现的目标是：
Country Segment Count of customer by segment sum of sales by segment
CAN 1 70 $3,000
CAN 2 30 $3,000
CAN 3 20 $3,000
CAN 4 110 $3,000
CAN 5 90 $3,000
CAN 6 10 $3,000
CAN 7 60 $3,000
CAN 8 5000 $3,000
CAN 9 2527.857143 $3,000
CAN 10 2939.880952 $3,000
US 1 3351.904762 $3,000
US 2 3763.928571 $3,000
US 3 4175.952381 $3,000
US 4 4587.97619 $3,000
US 5 5000 $3,000
US 6 5412.02381 $3,000
US 7 5824.047619 $3,000
US 8 6236.071429 $3,000
US 9 6648.095238 $3,000
US 10 7060.119048 $3,000
我如何实现这一目标？
答案 0 :(得分：0)
如果要保留原始表中的所有记录，同时还显示一些聚合，则分区将非常有用。但是，根据您向我们展示的内容，您似乎想要一个结果集，其中每个Country / Segment出现一次。在这种情况下，简单的GROUP BY应该有效：
SELECT Country, Segment, COUNT(*) AS `Count of customer by segment`,
SUM(Sales) AS `sum of sales by segment`
FROM yourTable
GROUP BY Country, Segment
ORDER BY Country, Segment