The relational data model organizes data into _____.

Question

BlackTom AI · Accepted Answer

A relational data model organizes data into tables made up of rows and columns.

1. Relevant knowledge points and concepts
- Relation: In the relational model, a relation is conceptually a table.
- Tuple: Each row in a relation is called a tuple; it represents a single record or instance.
- Attribute: Each column corresponds to an attribute describing a property of the tuples.
- Schema vs. instance: The schema defines the structure (attribute names and types); an instance is the set of tuples (rows) currently stored.
- Keys and integrity: Primary keys uniquely identify tuples; foreign keys model relationships between tables.
- Comparison to other models: Network, hierarchical, and object models organize data differently (graphs, trees, or classes/objects).

2. Step-by-step reasoning
- The relational model, as defined by E. F. Codd, treats data as relations. A relation is represented as a two-dimensional table.
- Each attribute (column) has a name and domain; each tuple (row) is an ordered set of attribute values.
- Operations (select, project, join) operate naturally on these tables, which is why the table representation is central to relational databases.

3. Intermediate steps / illustrative example
- Example table “Students”: columns (StudentID, Name, Major); rows: (1001, "Ana", "Biology"), (1002, "Ben", "CS").
- StudentID is a primary key uniquely identifying each row (tuple). This demonstrates rows and columns structure.

4. Why the correct answer is correct
- The statement “tables made up of rows and columns” exactly matches the formal relational concept of relations (tables), tuples (rows), and attributes (columns). The relational model’s theory and all standard SQL implementations use this tabular representation.

5. Why other options are incorrect
- “Linked nodes in a network” describes the network data model (graph-like), not the relational model.
- “Object classes” corresponds to object-oriented/object-relational models where data are objects with methods.
- “Parent-child hierarchies” describes the hierarchical model (tree structures), not the relational model.

6. Conclusion
The correct choice is “Tables made up of rows and columns,” which matches the provided answer.

The relational data model organizes data into _____.单项选择题

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A row is the same as a record in a relational database

Question at position 49 Relational databases establish the relationships between entities by means of common fields included in a file called a(n):entity.relation.association.relationship.

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.

Question at position 29 Unlike columns, the rows of a relation may not be interchanged and must be stored in one sequence. TrueFalse

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