Foundations Track · Easy · 15 min
Trainer Certification Coverage
The operations team needs trainers who can cover every required warehouse course. Return the trainer_id values for trainers who hold all three certifications...
Company labels are directional practice context, not official interview guidance.
Objective
Practice query basics through a LinkedIn-tagged business scenario.
Approach
Use this track to lock in clean query structure, basic filtering logic, and confidence with grouped output.
Company context
Company labels are directional practice context, not official interview guidance.
The operations team needs trainers who can cover every required warehouse course. Return the trainer_id values for trainers who hold all three certifications: Forklift, Hazmat, and Refrigerated Storage. Sort by trainer_id.
trainer_certifications
| trainer_id | certification |
|---|---|
| 11 | Forklift |
| 11 | Hazmat |
| 11 | Refrigerated Storage |
| 12 | Forklift |
| 12 | Hazmat |
| 13 | Forklift |
| 13 | Hazmat |
| 13 | Refrigerated Storage |
| 13 | Safety Basics |
| 14 | Refrigerated Storage |
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