Question at position 47 The number of entity types that participate in a relationship is called the: degree.counter.number.identifying characteristic.单项选择题
A
degree.
B
counter.
C
number.
D
identifying characteristic.

Question

Question at position 47 The number of entity types that participate in a relationship is called the: degree.counter.number.identifying characteristic.

BlackTom AI · Accepted Answer

The number of entity types that participate in a relationship is called the degree.

Relevant concepts: In Entity-Relationship (ER) modeling, a relationship links entity types. Two related but distinct terms are degree (also called arity) and cardinality (or multiplicity). Degree/arity denotes how many distinct entity types are involved in the relationship. Cardinality/multiplicity describes how many instances of one entity type may be associated with instances of another (e.g., one-to-many).

Step-by-step reasoning:
1. Define the property to identify: "number of entity types that participate" refers to counting distinct entity types in the relationship schema, not counting instances.
2. Recall standard terminology: ER literature defines degree (or arity) as the count of entity types in a relationship. Examples illustrate this definition:
   - Unary (degree 1): an employee supervises another employee (self-relationship) involves one entity type → degree = 1.
   - Binary (degree 2): an employee works in a department involves two entity types → degree = 2.
   - Ternary (degree 3): a supplier supplies a part to a project involves three entity types → degree = 3.
3. Contrast with alternate terms to rule them out:
   - Cardinality/multiplicity concerns how many instances of one entity relate to another (one-to-one, one-to-many, many-to-many), not how many entity types are involved.
   - “Counter” is not a standard ER modeling term for this concept.
   - “Number.” is ambiguous and not the formal term; the formal term is degree (or arity).
   - “Identifying characteristic.” refers to keys or identifying relationships (used to identify weak entities), not the count of participating entity types.

Why degree is correct: Degree directly and specifically names the count of distinct entity types in a relationship and is the canonical ER modeling term for that concept (binary, ternary, etc.).

Therefore, the correct answer is: degree. This matches the provided answer.

Question at position 47 The number of entity types that participate in a relationship is called the: degree.counter.number.identifying characteristic.单项选择题

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