The composite entity has its own attributes and primary key, and it serves as a connector between the two entities it relates. In the case of the student and course entities, a composite entity called "enrollment" could be created, which would have attributes such as "semester," "grade," ...
For this reason, there seems to be no simple solution to support content-based queries in a video database. The meaning of a video scene can be interpreted by multiple levels of abstraction and its description can be varied among different users. Therefore, it is important for a user to ...