Find the name of instructors who are advisors of students from the Math department, and sort the results by students' total credit.
SELECT T2.name FROM advisor AS T1 JOIN instructor AS T2 ON T1.i_id  =  T2.id JOIN student AS T3 ON T1.s_id  =  T3.id WHERE T3.dept_name  =  'Math' ORDER BY T3.tot_cred
instructors who are advisors refers to JOIN between advisor and instructor tables; students from the Math department refers to student.dept_name = 'Math'; sort the results by students' total credit refers to ORDER BY student.tot_cred;