Show me all about the document with id 1.
select * from documents where document_id = 1;
What about role codes of the employees who appeared in the circulation history of it?
select employees.role_code from employees join circulation_history on circulation_history.employee_id = employees.employee_id where circulation_history.document_id = 1;
What about these employees' names?
select employees.employee_name from employees join circulation_history on circulation_history.employee_id = employees.employee_id where circulation_history.document_id = 1;