Question at position 32 Relational databases establish the relationships between entities by means of common fields included in a file called a(n):association.relationship.entity.relation.单项选择题
A
association.
B
relationship.
C
entity.
D
relation.

Question

Question at position 32 Relational databases establish the relationships between entities by means of common fields included in a file called a(n):association.relationship.entity.relation.

BlackTom AI · Accepted Answer

1. Relevant knowledge points and concepts
A relation in the relational database model is the formal name for what is commonly called a table or file. A relation consists of tuples (rows) and attributes (columns/fields). Entities or entity sets from an ER (entity–relationship) model are typically mapped to relations. Relationships between entities are implemented by sharing common fields (attributes) such as primary keys and foreign keys across relations.

2. Step-by-step reasoning
- The question describes a file that contains common fields used to establish relationships between entities.
- In relational theory, a “file” of records with fields is called a relation (or table).
- To link two entities, one relation will include a field that matches a key field in another relation (for example, Orders.CustomerID matching Customers.CustomerID).
- This common field pair (primary key in one relation, foreign key in another) is how relationships are enforced and navigated in a relational database.

3. Intermediate items / illustrative example
- Customers relation: CustomerID (PK), Name, Address
- Orders relation: OrderID (PK), CustomerID (FK), OrderDate
- The common field CustomerID appears in both relations; the Orders relation’s CustomerID references the Customers relation’s primary key to establish the relationship.

4. Why the correct answer is correct
“Relation” is the formal term for the file/table that stores records and fields. Relationships are created by common fields contained in these relations. Therefore the phrase in the question best fits “relation.”

5. Why the other options are incorrect
- association: Not the standard term for a database file; more of a general English term.
- relationship: Describes the connection between entities, not the file that contains fields.
- entity: Represents an object or concept; an entity set may be implemented as a relation, but “entity” is not the file itself as asked.

6. Conclusion
The correct answer is relation. This matches the provided answer: "relation."

Question at position 32 Relational databases establish the relationships between entities by means of common fields included in a file called a(n):association.relationship.entity.relation.单项选择题

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