| hhid | respond | a2001 |
| 201100016 | 1 | 1 |
| 201100016 | 0 | 2 |
| 201100049 | 1 | 1 |
| 201100049 | 0 | 2 |
| 201100053 | 1 | 1 |
| 201100053 | 0 | 2 |
| 201100057 | 1 | 1 |
| 201100057 | 0 | 2 |
| 201100071 | 1 | 1 |
| 201100071 | 0 | 2 |
| 201100071 | 0 | 6 |
| 201100075 | 1 | 1 |
| 201100075 | 0 | 2 |
| 201100085 | 1 | 1 |
| 201100085 | 0 | 2 |
| 201100090 | 1 | 1 |
| 201100090 | 0 | 2 |
| 201100107 | 1 | 1 |
| 201100107 | 0 | 2 |
| 201100109 | 1 | 1 |
| 201100109 | 0 | 2 |
请问如何按照a2001列里含有6的条目来保留同一hhid的项目?即比如hhid为
201100071是含有a2001为6的,我保留所有hhid为201100071的行。其他不含a2001为6的hhid都删除?谢谢