SELECT T2.Lname FROM DEPARTMENT AS T1 JOIN FACULTY AS T2 ON T1.DNO = T3.DNO JOIN MEMBER_OF AS T3 ON T2.FacID = T3.FacID WHERE T1.DName = "Computer Science"
Find the last names of faculties who are members of computer science department.
CREATE TABLE DEPARTMENT (
    DNO VARCHAR,
    DName VARCHAR
)

CREATE TABLE MEMBER_OF (
    DNO VARCHAR,
    FacID VARCHAR
)

CREATE TABLE FACULTY (
    Lname VARCHAR,
    FacID VARCHAR
)