| Definition: | CLASS CODE INDICATES THE ACADEMIC LEVEL OF THE STUDENT. |
| Key: | CLASS CODE IS A ONE BYTE FIELD BETWEEN 1 AND 9. |
| CLASS CODE | CLASS DESCRIPTION | begin date | end date |
| 0 | UNDETERMINED | 1801-01-01 | 1980-05-29 |
| 1 | FRESHMAN | 1801-01-01 | 9999-01-01 |
| 2 | SOPHOMORE | 1801-01-01 | 9999-01-01 |
| 3 | JUNIOR | 1801-01-01 | 9999-01-01 |
| 4 | SENIOR | 1801-01-01 | 9999-01-01 |
| 5 | GRADUATE | 1801-01-01 | 9999-01-01 |
| 7 | LAW | 1801-01-01 | 9999-01-01 |
| 9 | MED SCHOOL | 1977-07-11 | 9999-01-01 |