要实现筛选出同一个销售人员连续3天(含3天)内无销售记录的数据。
数据输入:
| ID | DATE | Sales_Sum |
| A | 2019/5/2 | 30 |
| C | 2019/5/4 | 21 |
| B | 2019/5/5 | 45 |
| A | 2019/4/28 | 9 |
| D | 2019/4/25 | 17 |
| C | 2019/5/2 | 11 |
| B | 2019/5/1 | 34 |
| A | 2019/4/26 | 24 |
| D | 2019/4/24 | 33 |
| A | 2019/4/21 | 6 |
需要实现的结果:
| ID | date1 | date2 | 间隔天数 |
| A | 2019/4/28 | 2019/5/2 | 3 |
| A | 2019/4/21 | 2019/4/26 | 4 |
| B | 2019/5/1 | 2019/5/5 | 3 |



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