假如有如下数据,
| index | name | amount |
| 1 | A | 10 |
| 2 | B | 14 |
| 3 | C | 3 |
| 4 | A | 4 |
| 5 | A | 15 |
| 6 | C | 9 |
| 7 | B | 12 |
| 8 | C | 6 |
| 9 | A | 7 |
要实现效果如下
| index | name | amount | 分組項數 | 分組累计 | 分組平均 |
| 1 | A | 10 | 4 | 36 | 9 |
| 2 | B | 14 | 2 | 26 | 13 |
| 3 | C | 3 | 3 | 18 | 6 |
| 4 | A | 4 | 4 | 36 | 9 |
| 5 | A | 15 | 4 | 36 | 9 |
| 6 | C | 9 | 3 | 18 | 6 |
| 7 | B | 12 | 2 | 26 | 13 |
| 8 | C | 6 | 3 | 18 | 6 |
| 9 | A | 7 | 4 | 36 | 9 |
循环怎弄 ?
还是不用循环, 各位有什么好的办法


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