我想知道每个销售人员在不同地区所做的销售。区域很多，销售人员也很多。
它们定期分配到不同的区域。记录销售数字和销售时间。
面积（表）
id name
1 A
2 B
3 G
4 D
and many more
推销员（桌）
id name
1 X
2 Y
3 Z
....and many more
日期时间分配（表）
id area salesman datetime
1 3 2 1st Feb 2020 9:00am
2 2 2 2nd Feb 2020 9:00am
3 4 1 3rd Feb 2020 11:00am
4 3 1 3rd Feb 2020 11:00am
5 1 3 5th Feb 2020 10:00am
6 2 1 5th Feb 2020 10:00am
7 4 3 6th Feb 2020 10:00am
销售额（表）
id area sales datetime
1 3 25 1st feb 2020 1:00pm
2 2 18 3rd Feb 2020 11:am
3 3 30 2nd Feb 2020 2:00pm
4 4 24 3rd Feb 2020 2:00pm
5 4 12 3rd Feb 2020.4:00pm
6 3 20 5th Feb 2020 2:00pm
7 1 24 4th Feb.2020.11:30am
8 1 38 6th Feb 2020.3:00pm
所以我对每个推销员的输出：
salesman area. 1st Feb. 2nd Feb. 3rd Feb 5th Feb. 6th Feb
2 3 25 30 38
2 2 18
1 4 30
1 3 36 20
3 1 24
基本上，每个推销员的推销员明智/区域明智/每日销售。
即使它不是枢轴形式。我会帮你的。
编辑：一个区域只能分配给一个推销员。当一个区域被重新分配时，假设之前的销售人员不再被分配到该区域