+--------------+---------+
| Column Name  | Type    |
+--------------+---------+
| student_id   | int     |
| student_name | varchar |
| major        | varchar |
+--------------+---------+
student_id 是这张表的唯一主键。
每一行包含有关学生及其学术专业的信息。

+---------------+---------+
| Column Name   | Type    |
+---------------+---------+
| session_id    | int     |
| student_id    | int     |
| subject       | varchar |
| session_date  | date    |
| hours_studied | decimal |
+---------------+---------+
session_id 是这张表的唯一主键。
每一行代表一个学生针对特定学科的学习时段。

输入：

students 表：

+------------+--------------+------------------+
| student_id | student_name | major            |
+------------+--------------+------------------+
| 1          | Alice Chen   | Computer Science |
| 2          | Bob Johnson  | Mathematics      |
| 3          | Carol Davis  | Physics          |
| 4          | David Wilson | Chemistry        |
| 5          | Emma Brown   | Biology          |
+------------+--------------+------------------+

study_sessions 表：

+------------+------------+------------+--------------+---------------+
| session_id | student_id | subject    | session_date | hours_studied |
+------------+------------+------------+--------------+---------------+
| 1          | 1          | Math       | 2023-10-01   | 2.5           |
| 2          | 1          | Physics    | 2023-10-02   | 3.0           |
| 3          | 1          | Chemistry  | 2023-10-03   | 2.0           |
| 4          | 1          | Math       | 2023-10-04   | 2.5           |
| 5          | 1          | Physics    | 2023-10-05   | 3.0           |
| 6          | 1          | Chemistry  | 2023-10-06   | 2.0           |
| 7          | 2          | Algebra    | 2023-10-01   | 4.0           |
| 8          | 2          | Calculus   | 2023-10-02   | 3.5           |
| 9          | 2          | Statistics | 2023-10-03   | 2.5           |
| 10         | 2          | Geometry   | 2023-10-04   | 3.0           |
| 11         | 2          | Algebra    | 2023-10-05   | 4.0           |
| 12         | 2          | Calculus   | 2023-10-06   | 3.5           |
| 13         | 2          | Statistics | 2023-10-07   | 2.5           |
| 14         | 2          | Geometry   | 2023-10-08   | 3.0           |
| 15         | 3          | Biology    | 2023-10-01   | 2.0           |
| 16         | 3          | Chemistry  | 2023-10-02   | 2.5           |
| 17         | 3          | Biology    | 2023-10-03   | 2.0           |
| 18         | 3          | Chemistry  | 2023-10-04   | 2.5           |
| 19         | 4          | Organic    | 2023-10-01   | 3.0           |
| 20         | 4          | Physical   | 2023-10-05   | 2.5           |
+------------+------------+------------+--------------+---------------+

输出：

+------------+--------------+------------------+--------------+-------------------+
| student_id | student_name | major            | cycle_length | total_study_hours |
+------------+--------------+------------------+--------------+-------------------+
| 2          | Bob Johnson  | Mathematics      | 4            | 26.0              |
| 1          | Alice Chen   | Computer Science | 3            | 15.0              |
+------------+--------------+------------------+--------------+-------------------+

解释：

• Alice Chen (student_id = 1):
  • 学习序列：Math → Physics → Chemistry → Math → Physics → Chemistry
  • 模式：3 门学科（Math，Physics，Chemistry）重复 2 个完整周期
  • 连续日期：十月 1-6，没有超过 2 天的间隔
  • 循环长度：3 门学科
  • 总时间：2.5 + 3.0 + 2.0 + 2.5 + 3.0 + 2.0 = 15.0 小时
• Bob Johnson (student_id = 2):
  • 学习序列：Algebra → Calculus → Statistics → Geometry → Algebra → Calculus → Statistics → Geometry
  • 模式：4 门学科（Algebra，Calculus，Statistics，Geometry）重复 2 个完整周期
  • 连续日期：十月 1-8，没有超过 2 天的间隔
  • 循环长度：4 门学科
  • 总时间：4.0 + 3.5 + 2.5 + 3.0 + 4.0 + 3.5 + 2.5 + 3.0 = 26.0 小时
• 未包含学生：
  • Carol Davis (student_id = 3)：仅 2 门学科（生物，化学）- 未满足至少 3 门学科的要求
  • David Wilson (student_id = 4)：仅 2 次学习课程，间隔 4 天 - 不符合连续日期要求
  • Emma Brown (student_id = 5)：没有记录学习课程

结果表以 cycle_length 降序排序，然后以 total_study_hours 降序排序。