Question at position 39 The name used for an entity type should never be the same in other E-R diagrams on which the entity appears. TrueFalse单项选择题
A
True
B
False

Question

Question at position 39 The name used for an entity type should never be the same in other E-R diagrams on which the entity appears. TrueFalse

BlackTom AI · Accepted Answer

Entity type names in E-R diagrams are labels for conceptual objects (for example, Customer, Order), and their reuse across diagrams is often necessary and acceptable.

1. Relevant knowledge points and concepts
- An entity type name identifies a class of real-world objects in an E-R (Entity-Relationship) model.
- Uniqueness is required within a single diagram or schema view to avoid ambiguity.
- Multiple diagrams can represent different views of the same system (submodels, subject-area diagrams, or phased designs). Reusing the same name across those diagrams is normal when they represent the same concept.
- Where different meanings are intended, qualifiers or distinct names (or namespaces) should be used to prevent confusion.

2. Step-by-step reasoning
- The statement asserts a rule of absolute prohibition: “The name used for an entity type should never be the same in other E-R diagrams on which the entity appears.”
- Consider a practical case: a “Customer” entity appears in an Orders diagram and in a Support diagram. Both diagrams model the same conceptual entity; using the same name promotes consistency and clarity.
- If two diagrams are different views of the same overall model, reusing names helps integrate and map entities across views.
- If two entities share a name but represent different concepts, that is bad practice; however that problem is addressed by choosing different names or using qualifiers, not by forbidding reuse when the concept is the same.

3. Intermediate steps / examples
- Example: Diagram A (Sales) has entity Customer with attributes (CustomerID, Name). Diagram B (Support) also has Customer (CustomerID, ContactPrefs). Using the same name clarifies they refer to the same real-world object and supports model integration.

4. Why the correct answer is correct
- The blanket prohibition is false because reuse is both common and desirable when the same entity concept appears in multiple diagrams. The correct practice is to ensure consistent naming for the same concept and different naming when concepts differ.

5. Why the other option is incorrect
- “True” would force different names even when the entity concept is identical across diagrams, which would cause unnecessary fragmentation, loss of clarity, and hinder integration.

6. Conclusion
- Therefore the correct response is False, which matches the provided answer.

Question at position 39 The name used for an entity type should never be the same in other E-R diagrams on which the entity appears. TrueFalse单项选择题

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