แผนภูมิแท่งแสดงการกระจายของ family_name และ sex_mf ไม่จำเป็นต้องใช้ตารางทั้งหมด
A bar chart shows the distribution of family_name and gender_mf .It is not neccessary to use all the tables.
 Course_Authors_and_Tutors:  author_id [ INTEGER]  author_tutor_ATB [ VARCHAR(3)]  login_name [ VARCHAR(40)]  password [ VARCHAR(40)]  personal_name [ VARCHAR(80)]  middle_name [ VARCHAR(80)]  family_name [ VARCHAR(80)]  gender_mf [ VARCHAR(1)]  address_line_1 [ VARCHAR(80)] 
SELECT family_name, gender_mf FROM Course_Authors_and_Tutors ORDER BY personal_name