Which one of the following statements regarding design tools used with database management systems is true?

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BlackTom AI · Accepted Answer

Question restatement: Which one of the following statements regarding design tools used with database management systems is true?

Option a: 'A data dictionary is a design tool used exclusively to communicate the relationship between tables.' This is misleading. A data dictionary documents data element definitions, meanings, formats, allowed values, and other metadata for database elements, not solely relationships. It is not exclusively about table relationships, so this statement is inaccurate.

Option b: 'An entity relationship diagram always includes important information such as the data type and field size of each field in a table.' In many ER diagrams, the focus is on entities, their attributes, and the relationships between entities. While attributes exist, ER diagrams do not always show detailed data types or field sizes for every attribute; these specifics are often captured in data dictionaries or table definitions rather than the diagram itself. Thus this claim overstates what ER diagrams typically display and is not universally true.

Option c: 'An entity relationship diagram shows all the fields within each table and the relationship between tables.' This statement aligns with the conventional understanding that ER diagrams represent entities (tables), their attributes (fields), and the relationships (links) between entities. It describes the core purpose of an ER diagram as a tool for visualizing structure and connections among data components, which is generally true in database design.

Option d: 'An entity relationship diagram is a design tool used to represent only the foreign keys that are required in a table.' This is incorrect because ER diagrams depict more than just foreign keys; they illustrate entities, their attributes (fields), and the relationships, not limited to foreign keys. Limiting ER diagrams to foreign keys ignores the broader modeling role they play.

Summary of reasoning: Among the options, only option c accurately reflects the typical role of an entity relationship diagram in database design by illustrating both the fields (attributes) of each table and the relationships between tables. The other statements either mischaracterize the scope of ER diagrams or inaccurately describe related tools like data dictionaries.

Which one of the following statements regarding design tools used with database management systems is true?

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