mysql - 保留细节的小计和总计

Question

我有一张发票表:

invoice_num, customer_ID, usd
1              A          15.2
2              B           3.6
3              A         105.1
4              C           6.0

我需要一份显示所有记录(发票)并为每个客户添加小计的报告。如果我只显示每个客户的总数(使用 GROUP BY customer_ID 和 WITH ROLLUP)，我知道该怎么做，但我需要保留详细信息，所以我无法对这些行进行分组。期望的输出是:

invoice_num  customer_ID   usd
1              A          15.2
3              A         105.1
Total customer A         120.3
2              B           3.6
Total customer B           3.6
4              C           6.0
Total customer C           6.0
Total customers          129.9

谢谢，

Answer 1

同时对 invoice_num 进行分组:

SELECT   invoice_num, customer_ID, SUM(usd)
FROM     my_table
GROUP BY customer_ID, invoice_num WITH ROLLUP

查看 sqlfiddle .