Relational model basics: In classical relational theory, a relation is most appropriately viewed as which of the following structures?

Introduction / Context:
Although mathematically a relation is a set of tuples over a set of attributes, in practical database systems we visualize relations as tables. This tabular view helps practitioners reason about rows, columns, and constraints.

Given Data / Assumptions:

• We consider the standard implementation of the relational model in SQL systems.
• Rows represent tuples (records) and columns represent attributes (fields).
• The table metaphor maps directly to operations like SELECT, INSERT, UPDATE, and DELETE.

Concept / Approach:

A two-dimensional table has rows and columns. This model suits set-based operations, keys, and relational algebra concepts (selection, projection, join). Higher “dimensions” are unnecessary for representing classical relations.

Step-by-Step Solution:

Verification / Alternative check:

Relational algebra and SQL statements operate on two-dimensional structures (tables/views). Multidimensional cubes belong to OLAP, not core relational theory.

Why Other Options Are Wrong:

Three/four/five-dimensional tables are not standard relational representations; those terms apply to analytical models, not base relations.

Common Pitfalls:

Confusing star/snowflake OLAP cubes with normalized OLTP tables.

Final Answer:

two-dimensional tables.