DB数据：
| ID | DEPT_ID | ClassID | M_YEAR | M_Month | M_SALARY | M_SCORE |
| 32 | 1 | 1 | 1 | 1 | 20 | 10 |
| 33 | 1 | 1 | 1 | 2 | 20 | 123 |
| 34 | 1 | 1 | 1 | 3 | 20 | 12 |
| 35 | 1 | 1 | 1 | 4 | 20 | 123 |
| 36 | 1 | 1 | 1 | 5 | 21 | 12 |
| 37 | 1 | 1 | 2 | 1 | 22 | 312 |
| 38 | 1 | 1 | 2 | 2 | 23 | 2 |
| 39 | 1 | 1 | 2 | 3 | 15 | 23 |
| 40 | 1 | 1 | 2 | 4 | 15 | 123 |
| 41 | 1 | 1 | 2 | 5 | 90 | 24 |
| 42 | 1 | 1 | 3 | 1 | 55 | 123 |
| 43 | 1 | 1 | 3 | 2 | 43 | 12 |
| 44 | 1 | 1 | 3 | 3 | 20 | 22 |
| 45 | 1 | 1 | 3 | 4 | 20 | 2 |
| 46 | 1 | 1 | 3 | 5 | 20 | 2 |
| 47 | 1 | 2 | 1 | 1 | 20 | 2 |
| 48 | 1 | 2 | 1 | 2 | 20 | 21 |
| 49 | 1 | 2 | 1 | 3 | 20 | 2 |
