Table schema:
CREATE TABLE DEPARTMENT (DNO VARCHAR, DName VARCHAR); CREATE TABLE MEMBER_OF (DNO VARCHAR, FacID VARCHAR); CREATE TABLE FACULTY (Lname VARCHAR, FacID VARCHAR)

Question: Find the last names of faculties who are members of computer science department.
SQL: 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"