Context: CREATE TABLE Students (first_name VARCHAR, student_id VARCHAR); CREATE TABLE Student_Addresses (student_id VARCHAR)
Question: What are the id and first name of the student whose addresses have the highest average monthly rental?
Answer: SELECT T1.student_id, T2.first_name FROM Student_Addresses AS T1 JOIN Students AS T2 ON T1.student_id = T2.student_id GROUP BY T1.student_id ORDER BY AVG(monthly_rental) DESC LIMIT 1