Using the Entity Relationship Diagram you have drawn on your piece of paper for the Final Subjects Results Table answer the following question.

Which relationship should be drawn between the Lecturers and Subjects entities for the Final Subjects Results Table?

Question

Using the Entity Relationship Diagram you have drawn  on your piece of paper for the Final Subjects Results Table answer the following question.

Which relationship should be drawn between the Lecturers and Subjects entities for the Final Subjects Results Table?

BlackTom AI · Accepted Answer

Question restatement: Using the Entity Relationship Diagram you have drawn on your piece of paper for the Final Subjects Results Table, answer: which relationship should be drawn between the Lecturers and Subjects entities?

Option analysis:
- Option 1: "" (empty). This option provides no content to evaluate. Since there is no stated relationship here, there is nothing to reason about beyond noting that this option is unusable as an answer.
- Option 2: "" (empty). Like Option 1, this option is blank and cannot convey a relationship. It cannot be selected as a meaningful choice because it does not describe any relationship between Lecturers and Subjects.
- Option 3: "There is no relationship between the Lecturers and Subjects entities." This statement asserts that the two entities are unrelated. In the provided data and business rules, lecturers teach subjects, and there is a constraint that a subject is taught by exactly one lecturer, while a lecturer can teach multiple subjects. This implies there is a relationship, specifically a one-to-many (1:N) relationship from Lecturers to Subjects. Therefore, declaring no relationship would contradict the business rules and the intended data model.
- Option 4: "" (empty). Again, this is a blank option that does not specify any relationship and is not usable for answering the question.

Contextual reasoning: The dataset’s business rules state several key points that shape the correct ERD relationship. Each lecturer may teach many subjects, and each subject can be taught by only one lecturer. This combination corresponds to a 1:N relationship from Lecturers to Subjects, typically implemented by placing a foreign key (LecturerID) in the Subjects entity referring to the Lecturers entity. Visually, this would be represented in an ERD by a line from Lecturers to Subjects with a crow’s foot near Subjects and a single line near Lecturers, often with identifying or non-identifying constraints depending on the exact modeling approach.

So, when evaluating the options, the only substantive statement about no relationship is option 3, which is inconsistent with the rules. The blank options fail to specify the relationship, and therefore cannot be used to justify a correct ERD choice. The correct interpretation based on the given rules is that Lecturers and Subjects are connected by a 1:N relationship, with Subjects referencing Lecturers, but none of the non-blank options provided describe that relationship accurately.

Using the Entity Relationship Diagram you have drawn on your piece of paper for the Final Subjects Results Table answer the following question. Which relationship should be drawn between the Lecturers and Subjects entities for the Final Subjects Results Table?

查看解析

登录即可查看完整答案

类似问题

A unary relationship:

In an entity relationship diagram, an associative entity is depicted by a(n)

In the figure below there exists a relationship between the Employee and the Dependent Relations. What type of relationship is shown?

A relationship between the instances of two entities is known as:

What would be the correct cardinality and modality for the following business rules? Each Vehicle has only one owner. But each owner can have more than one vehicle.

Given the E/R diagram below, which of the following statements is true? Select one answer.

Which statement below is likely to be true?

_______ entities have many common attributes and relationships.

更多留学生实用工具

考试浏览器助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单