| Entity name | Entity type | Primary key | # attributes |
| tce_answers | independent | answer_id | 5 |
| tce_questions | independent | question_id | 6 |
| tce_sessions | independent | cpsession_id | 3 |
| tce_subjects | independent | subject_id | 5 |
| tce_test_subject_set | independent | tsubset_id | 6 |
| tce_test_subjects | dependent | tsubset_id, subject_id | 2 |
| tce_testgroups | dependent | test_id, group_id | 2 |
| tce_tests | independent | test_id | 12 |
| tce_tests_logs | independent | testlog_id | 9 |
| tce_tests_logs_answers | dependent | testlog_id, answer_id | 4 |
| tce_tests_users | independent | testuser_id | 6 |
| tce_user_groups | independent | group_id | 2 |
| tce_users | independent | user_id | 14 |
| tce_usrgroups | dependent | user_id, group_id | 2 |