| id | year | treat |
1 | 1995 | |
1 | 1996 | |
1 | 1997 | |
1 | 1998 | |
1 | 1999 | |
1 | 2000 | 3 |
1 | 2001 | |
1 | 2002 | |
1 | 2003 | |
2 | 1995 | |
2 | 1996 | |
2 | 1997 | |
2 | 1998 | |
2 | 1999 | |
2 | 2000 | 2 |
2 | 2001 | |
2 | 2002 | |
2 | 2003 |
我想将第三列填充为
| id | year | treat |
1 | 1995 | -2 |
1 | 1996 | -1 |
1 | 1997 | 0 |
1 | 1998 | 1 |
1 | 1999 | 2 |
1 | 2000 | 3 |
1 | 2001 | 4 |
1 | 2002 | 5 |
1 | 2003 | 6 |
2 | 1995 | -3 |
2 | 1996 | -2 |
2 | 1997 | -1 |
2 | 1998 | 0 |
2 | 1999 | 1 |
2 | 2000 | 2 |
2 | 2001 | 3 |
2 | 2002 | 4 |
2 | 2003 | 5 |
如何系统地填充?


雷达卡





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