The above ER diagram means that an employee can work for multiple departments, and a department can have at most one employee.

Question

BlackTom AI · Accepted Answer

In ER diagrams the cardinality markers "1" and "M" (many) indicate how many instances of the entity next to the marker may participate in the relationship for each instance of the opposite entity. The marker is read toward the entity it is adjacent to: the symbol next to Employee tells how many Employees can be associated with one Department, and the symbol next to Department tells how many Departments can be associated with one Employee.

Step-by-step reasoning:
1. Identify the cardinalities shown: the diagram shows "M" adjacent to the Employee entity and "1" adjacent to the Department entity.
2. Interpret the marker near Employee: "M" next to Employee means that for a single Department there may be many Employees associated with it (i.e., a department can have many employees).
3. Interpret the marker near Department: "1" next to Department means that for a single Employee there can be at most one Department associated with that employee (i.e., an employee can work for at most one department).
4. Translate into plain language: each Employee -> at most one Department; each Department -> many Employees.

Why the correct answer is False:
- The statement in the question reverses these interpretations: it claims an employee can work for multiple departments and a department can have at most one employee. That is the opposite of what the diagram shows. Because the actual diagram indicates Employee has cardinality 1 (per Employee at most one Department) and Department has cardinality M (per Department many Employees), the given statement is incorrect.

Why the other option (True) is incorrect:
- Accepting "True" would require swapping the meanings of the cardinality markers; that contradicts how ER cardinalities are read and therefore is wrong.

Conclusion: The correct evaluation is False, matching the provided answer.

The above ER diagram means that an employee can work for multiple departments, and a department can have at most one employee. 判断题

类似问题

Total participation (or mandatory participation) of an entity in a relationship is indicated by:

In which project stage is an entity-relationship (ER) diagram created?

Below is an entity-relationship diagram for a relational database: Which best describes the relationship between customers and sales?

Question at position 28 In the figure below, what is depicted? A one-to-many relationshipA unary relationshipA one-to-one relationshipAn associative entity

Question at position 2 The lines on a ER diagram represent the entities and should be labeled with nouns just like a DFD diagram.TrueFalse

A one-to-many relationship between two entities is symbolized in a diagram by a line that ends with:

A derived attribute is indicated in the Chen notation by a _____ that connects the attribute and an entity.

In an ER diagram, the weak entity is typically depicted with a ___ _, and the relationship between the weak entity and the strong entity is shown with a _____.

更多留学生实用工具

智能学习助手

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