Using AdventureWorks

Hello. My professor gave me this code (and similar code) for homework on adventure works, but it doesn't make any sense because a lot of these fields don't exist AND employees is humanresources.employee in the database. I'm thinking he's putting code for an oracle course or something....this doesn't make sense. 

SELECT employee_id, last_name, job_id, hire_date StartDate
FROM   employees;