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| id | user | upgrade |
|---|---|---|
| 0 | A | null |
| 1 | B | null |
| 2 | C | A |
| 3 | A | null |
| user | nb | nb_upgd |
|---|---|---|
| A | 2 | 1 |
| B | 1 | 0 |
| C | 1 | 0 |
| id | user | upgrade |
|---|---|---|
| 0 | A | null |
| 1 | B | null |
| 2 | C | A |
| 3 | A | null |
| user | nb | nb_upgd |
|---|---|---|
| A | 2 | 1 |
| B | 1 | 0 |
| C | 1 | 0 |