Question

A domain in a relational database refers to:

• A. The overall database structure
• B. A specific set of valid values for an attribute
• C. A table containing multiple records
• D. A relationship between two tables

Answer 1

The Correct Option is B

Within relational databases, a domain represents the defined set of permissible values for an attribute. Every column in a table is linked to a specific domain, guaranteeing that all entries conform to a pre-established range of acceptable data. This principle is vital for preserving data integrity and uniformity throughout the database.

The provided options distinguish various relational database concepts:

• Database architecture: This pertains to the database schema, encompassing tables, relationships, and restrictions.
• A defined collection of valid values for an attribute: This accurately defines a domain, enforcing limitations on data entries.
• A table with numerous records: This is termed a table or relation, not a domain.
• A linkage between two tables: This is identified as a foreign key relationship, connecting tables via common data.

Consequently, establishing the domain for each attribute within a database schema facilitates the enforcement of strong data validation protocols, aligning with the correct definition: A specific set of valid values for an attribute.