Which of the following best describes the relationship between a Data Dictionary and an ERD?

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BlackTom AI · Accepted Answer

In this question about the relationship between a Data Dictionary and an ERD, we need to evaluate what each option implies about their roles. 
Option a: 'Both represent database tables in graphical form.' This is inaccurate because an ERD is a graphical representation of entities and relationships, not the actual database tables themselves, and a data dictionary is a catalog of metadata, not a graphical table diagram. It mischaracterizes both artifacts. 
Option b: 'The data dictionary gives details for entities in the ERD.' This is correct because the data dictionary stores metadata about the data elements, such as entity attributes, data types, sizes, constraints, and relationships, which complement the entities and attributes depicted in the ERD. It provides the details that flesh out what the ERD shows at a higher level. 
Option c: 'The data dictionary replaces the need for ERD modelling.' This is not true; a data dictionary augments an ERD by documenting specifics, but it does not substitute the visual model used to design and communicate the structure of the database. ERDs and data dictionaries serve different, complementary purposes. 
Option d: 'The ERD defines field sizes listed in the data dictionary.' This is a misstatement; while ERDs may show entities and relationships, field sizes and other granular attributes are typically defined in the data dictionary, not the ERD itself. The data dictionary contains those field-level details, and the ERD references entities and relationships but not detailed sizes.

Systems Analysis and Design (082025-TVM)

Which of the following best describes the relationship between a Data Dictionary and an ERD?

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