教室 教师 课程 三元关系er图
时间: 2023-07-23 08:03:13 浏览: 126
教室、教师和课程之间的三元关系ER图可以如下所示:
```
+-----------------+ +----------------+ +------------------+
| Classroom | | Teacher | | Course |
+-----------------+ +----------------+ +------------------+
| classroom_id | | teacher_id | | course_id |
| capacity | | name | | name |
| | | specialization| | description |
+-----------------+ +----------------+ +------------------+
| | | | | |
| +-----------+ | | +-----------+ | | +-----------+ |
| | | | | | | | | | | |
| |Teaches_in |--|-|-<|--|Teaches |--->|-|-|Teaches_in| |
| | | |
阅读全文
相关推荐

















