Database: college_1
Question: Find names of all students who took some course and got A or C.
SQL: select t1.stu_fname ,  t1.stu_lname from student as t1 join enroll as t2 on t1.stu_num  =  t2.stu_num where t2.enroll_grade  =  'c' or t2.enroll_grade  =  'a'