CREATE TABLE advisor (i_id VARCHAR2, s_id VARCHAR2)
CREATE TABLE student (id VARCHAR2, dept_name VARCHAR2, tot_cred VARCHAR2)
CREATE TABLE instructor (name VARCHAR2, id VARCHAR2)

Find the name of instructors who are advisors of the 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
SELECT "T2"."name" FROM "advisor" "T1" JOIN "instructor" "T2" ON "T1"."i_id" = "T2"."id" JOIN "student" "T3" ON "T1"."s_id" = "T3"."id" AND "T3"."dept_name" = 'Math' ORDER BY "T3"."tot_cred"