What type of diagram is used to represent the relational structure of a database?

• A. Network Diagram
• B. ERD
• C. Flowchart
• D. Venn Diagram

Answer: (B)

The correct answer is an Entity-Relationship Diagram (ERD), which is specifically designed to illustrate the relational structure of a database. An ERD visually represents the entities within a system and the relationships between those entities. This type of diagram helps in understanding how different data elements interact with one another and showcases the attributes of each entity.

In a typical ERD, entities are often represented as rectangles, relationships are depicted as lines connecting the entities, and attributes may be shown as ovals or listed with the entities. This visualization is crucial during the design phase of database development, as it aids in ensuring that all needed relationships and entities are accounted for before implementation.

The other options are used for different purposes: network diagrams illustrate the configuration of a network, flowcharts depict processes or workflows, and Venn diagrams typically demonstrate logical relationships and comparisons, but none of these accurately represent the relational structure of a database like an ERD does.