小计和总计保持细节

Question

我有一张带发票的桌子:

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

我需要一份报告显示所有记录(发票)并为每位客户添加小计.我知道如果我只显示每个客户的总数(使用GROUP BY customer_ID和WITH ROLLUP),但是我需要保留详细信息,所以我无法对这些行进行分组.所需的输出是:

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

还分组invoice_num:

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

在sqlfiddle上看到它.