1412. Find the Quiet Students in All Exams

https://leetcode.com/problems/find-the-quiet-students-in-all-exams

Description

Table: Student

+---------------------+---------+
| Column Name         | Type    |
+---------------------+---------+
| student\_id          | int     |
| student\_name        | varchar |
+---------------------+---------+
student\_id is the primary key for this table.
student\_name is the name of the student.

Table: Exam

+---------------+---------+
| Column Name   | Type    |
+---------------+---------+
| exam\_id       | int     |
| student\_id    | int     |
| score         | int     |
+---------------+---------+
(exam\_id, student\_id) is the primary key for this table.
Student with student\_id got score points in exam with id exam\_id.

A "quite" student is the one who took at least one exam and didn't score neither the high score nor the low score.

Write an SQL query to report the students (student_id, student_name) being "quiet" in ALL exams.

Don't return the student who has never taken any exam. Return the result table ordered by student_id.

The query result format is in the following example.

Student table:
+-------------+---------------+
| student\_id  | student\_name  |
+-------------+---------------+
| 1           | Daniel        |
| 2           | Jade          |
| 3           | Stella        |
| 4           | Jonathan      |
| 5           | Will          |
+-------------+---------------+
Exam table:
+------------+--------------+-----------+
| exam\_id    | student\_id   | score     |
+------------+--------------+-----------+
| 10         |     1        |    70     |
| 10         |     2        |    80     |
| 10         |     3        |    90     |
| 20         |     1        |    80     |
| 30         |     1        |    70     |
| 30         |     3        |    80     |
| 30         |     4        |    90     |
| 40         |     1        |    60     |
| 40         |     2        |    70     |
| 40         |     4        |    80     |
+------------+--------------+-----------+
Result table:
+-------------+---------------+
| student\_id  | student\_name  |
+-------------+---------------+
| 2           | Jade          |
+-------------+---------------+
For exam 1: Student 1 and 3 hold the lowest and high score respectively.
For exam 2: Student 1 hold both highest and lowest score.
For exam 3 and 4: Studnet 1 and 4 hold the lowest and high score respectively.
Student 2 and 5 have never got the highest or lowest in any of the exam.
Since student 5 is not taking any exam, he is excluded from the result.
So, we only return the information of Student 2.

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