| year | industry | id | unrelate |
| 2001 | A | 200001 | 1 |
| 2002 | A | 200001 | 0 |
| 2003 | A | 200001 | 0 |
| 2004 | A | 200001 | 1 |
| 2005 | A | 200001 | 0 |
| 2001 | A | 300001 | 0 |
| 2002 | A | 300001 | 1 |
| 2003 | A | 300001 | 0 |
| 2004 | A | 300001 | 0 |
| 2005 | A | 300001 | 1 |
| 2001 | B | 400001 | 0 |
| 2002 | B | 400001 | 1 |
| 2003 | B | 400001 | 0 |
| 2004 | B | 400001 | 0 |
| 2005 | B | 400001 | 0 |
| 2001 | B | 500001 | 0 |
| 2002 | B | 500001 | 1 |
| 2003 | B | 500001 | 1 |
| 2004 | B | 500001 | 1 |
| 2005 | B | 500001 | 1 |
如上表,unrelate=1则是出现unrelate一次;现在我想求每个id对应的,这个行业(industry)去年除了该公司(id)以外的unrelate出现的次数。
有没有老师能够帮帮我?非常感谢!!!