Find the name and salary of instructors who are advisors of the students from the Math department.
SELECT T2.name ,  T2.salary 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'
instructors who are advisors refers to JOIN between advisor and instructor tables on advisor.i_id = instructor.id; students from the Math department refers to condition WHERE dept_name = 'Math'; name and salary of instructors refers to SELECTing name and salary columns from the instructor table;