调试中...
行 1，列 1
Players =
| player_id | group_id |
| --------- | -------- |
| 10 | 2 |
| 15 | 1 |
| 20 | 3 |
| 25 | 1 |
| 30 | 1 |
| 35 | 2 |
| 40 | 3 |
| 45 | 1 |
| 50 | 2 |
Matches =
| match_id | first_player | second_player | first_score | second_score |
| -------- | ------------ | ------------- | ----------- | ------------ |
| 1 | 15 | 45 | 3 | 0 |
| 2 | 30 | 25 | 1 | 2 |
| 3 | 30 | 15 | 2 | 0 |
| 4 | 40 | 20 | 5 | 2 |
| 5 | 35 | 50 | 1 | 1 |
[object Object]