Database: college_1
Question: What is the last name of the student who got a grade A in the class with code 10018.
SQL:
SELECT T1.stu_lname FROM student AS T1 JOIN enroll AS T2 ON T1.stu_num  =  T2.stu_num WHERE T2.enroll_grade  =  'A' AND T2.class_code  =  10018