ระบุรหัสพนักงานของแพทย์พร้อมกับรหัสแผนกสังกัดหลัก
List the physicians' employee ids together with their primary affiliation departments' ids.
df = pd.DataFrame(columns=['physician', 'department', 'primaryaffiliation'])
df[df['primaryaffiliation']==1][['physician', 'department']]