text: -- https://www.hackerrank.com/challenges/placements/problem
  
  SELECT STUDENTS.NAME
  FROM STUDENTS INNER JOIN FRIENDS ON STUDENTS.ID=FRIENDS.ID
      INNER JOIN PACKAGES PA ON STUDENTS.ID=PA.ID
      INNER JOIN PACKAGES PB ON FRIENDS.FRIEND_ID=PB.ID
  WHERE PB.SALARY>PA.SALARY
  ORDER BY PB.SALARY