Question: Find the name of instructors who are advisors of students from the Math department, and sort the results by students' total credit.
SQL: 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