| candidate_id | skill | proficiency |
| ------------ | ---------- | ----------- |
| 101 | Python | 5 |
| 101 | Tableau | 3 |
| 101 | PostgreSQL | 4 |
| 101 | TensorFlow | 2 |
| 102 | Python | 4 |
| 102 | Tableau | 5 |
| 102 | PostgreSQL | 4 |
| 102 | R | 4 |
| 103 | Python | 3 |
| 103 | Tableau | 5 |
| 103 | PostgreSQL | 5 |
| 103 | Spark | 4 |