Task: Text to Code
Input (English): Step 1: find the minimum department_id in Staff_Department_Assignments table.
Step 2: find the staff_id of Staff_Department_Assignments table whose date_assigned_to less than the results of step 1
Output (English): SELECT staff_id FROM Staff_Department_Assignments WHERE date_assigned_to < ( SELECT Min ( department_id ) FROM Staff_Department_Assignments )