| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
|---|---|---|---|---|---|---|---|---|---|
| 1 | SIMPLE | trainings_device_and_training | ref | PRIMARY, IDX_E7572806161BA2FF, IDX_E75728068394A420 | PRIMARY | 4 | const | 3 | Using index |
| 1 | SIMPLE | t0 | eq_ref | PRIMARY | PRIMARY | 4 | afpma-webapp.trainings_device_and_training.device_and_training_id | 1 |