Table: Project

    1. +-------------+---------+
    2. | Column Name | Type    |
    3. +-------------+---------+
    4. | project_id  | int     |
    5. | employee_id | int     |
    6. +-------------+---------+
    7. 主键为 (project_id, employee_id)。
    8. employee_id 是员工表 Employee 表的外键。

    Table: Employee

    1. +------------------+---------+
    2. | Column Name      | Type    |
    3. +------------------+---------+
    4. | employee_id      | int     |
    5. | name             | varchar |
    6. | experience_years | int     |
    7. +------------------+---------+
    8. 主键是 employee_id。

    编写一个SQL查询，报告所有雇员最多的项目。
    查询结果格式如下所示：

    1. Project table:
    2. +-------------+-------------+
    3. | project_id  | employee_id |
    4. +-------------+-------------+
    5. | 1           | 1           |
    6. | 1           | 2           |
    7. | 1           | 3           |
    8. | 2           | 1           |
    9. | 2           | 4           |
    10. +-------------+-------------+
    12. Employee table:
    13. +-------------+--------+------------------+
    14. | employee_id | name   | experience_years |
    15. +-------------+--------+------------------+
    16. | 1           | Khaled | 3                |
    17. | 2           | Ali    | 2                |
    18. | 3           | John   | 1                |
    19. | 4           | Doe    | 2                |
    20. +-------------+--------+------------------+
    22. Result table:
    23. +-------------+
    24. | project_id  |
    25. +-------------+
    26. | 1           |
    27. +-------------+
    28. 第一个项目有3名员工，第二个项目有2名员工。