MySQL如何从下表中选择最高的每对值？

Question

我有如下表：

+----+---------+---------+-------+ 
| ID | FARM_ID | GATE_ID | SCORE | 
+----+---------+---------+-------+ 
| 1 |  1 |  1 | 100 | 
| 2 |  2 |  1 | 100 | 
| 3 |  5 |  5 | 100 | 
| 4 |  4 |  1 | 16 | 
| 5 |  4 |  3 | 16 | 
| 6 |  4 |  5 | 23 | 
| 7 |  5 |  1 | 100 | 
| 8 |  4 |  1 | 95 | 
| 9 |  4 |  3 | 91 | 
| 10 |  4 |  5 | 100 | 
| 11 |  5 |  1 | 20 | 
| 12 |  4 |  1 | 100 | 
| 13 |  4 |  3 | 95 | 
| 14 |  4 |  5 | 95 | 
| 15 |  4 |  6 | 91 | 
| 16 |  5 |  1 | 16 | 
| 17 |  4 |  1 | 95 | 
| 18 |  4 |  2 | 91 | 
| 19 |  4 |  3 | 100 | 
| 20 |  4 |  5 | 91 | 
| 21 |  4 |  6 | 95 | 
| 22 |  4 |  1 | 91 | 
| 23 |  4 |  2 | 95 | 
| 24 |  4 |  3 | 95 | 
| 25 |  4 |  4 | 91 | 
| 26 |  4 |  6 | 100 | 
| 27 |  4 |  2 | 100 | 
| 28 |  4 |  3 | 91 | 
| 29 |  4 |  4 | 95 | 
| 30 |  4 |  6 | 95 | 
| 31 |  4 |  2 | 95 | 
| 32 |  4 |  4 | 100 | 
| 33 |  4 |  6 | 91 | 
| 34 |  5 |  3 | 100 | 
| 35 |  5 |  6 | 100 | 
| 36 |  5 |  2 | 100 | 
| 37 |  5 |  4 | 100 | 
| 38 |  3 |  1 | 91 | 
| 39 |  3 |  5 | 100 | 
| 40 |  3 |  1 | 100 | 
| 41 |  3 |  3 | 91 | 
| 42 |  3 |  5 | 91 | 
| 43 |  3 |  1 | 91 | 
| 44 |  3 |  3 | 100 | 
| 45 |  3 |  6 | 91 | 
| 46 |  3 |  2 | 91 | 
| 47 |  3 |  3 | 91 | 
| 48 |  3 |  6 | 100 | 
| 49 |  3 |  2 | 100 | 
| 50 |  3 |  4 | 91 | 
| 51 |  3 |  6 | 91 | 
| 52 |  3 |  2 | 91 | 
| 53 |  3 |  4 | 100 | 
| 54 |  8 |  1 | 100 | 
| 55 |  7 |  1 | 100 | 
| 56 |  6 |  1 | 100 | 
+----+---------+---------+-------+ 

期望的结果：

我希望仅显示每个FARM_ID--GATE_ID对得分最高。 （上面应该有23个唯一的对，因此）。

非常感谢！

Answer 1

select farm_id, gate_id, max(score) 
from table 
group by farm_id, gate_id 

？