桌子：
| User_ID | Red | Blue | Green | Rating |
| a | 23 | 33 | 42 | 99 |
| a | 56 | 45 | 62 | 45 |
| a | 23 | 49 | 28 | 67 |
| b | 39 | 59 | 10 | 87 |
| b | 18 | 28 | 59 | 38 |
| b | 40 | 50 | 38 | 94 |
我想要获得的结果是 user_id …