Entity Relationship Diagrams (ERD)

Conceptual ERD = Most abstraction, used by business analysts for large projects Logical ERD = Adds more detail by defining operational and transactional entities Physical ERD = Actual design/blueprint with technical details including cardinality Cardinality = Specifies the numerical attribute of the relationship between entities

Ordinality = Describes the relationship as mandatory or optional Conceptual ERD = General, high-level view of database design Logical ERD = Model that defines additional operational entities Physical ERD = Actual database design with many technical details

Cardinality = Specifies maximum number of relationships Ordinality = Specifies minimum number of relationships Conceptual ERD = Abstraction with least detail, suitable for large projects Physical ERD = Detailed design including primary and foreign keys

<p>Cardinality specifies the numerical attribute of the relationship between entities.</p> Signup and view all the answers

<p>Ordinality describes the relationship as either mandatory or optional, whereas cardinality specifies the occurrences of a relationship.</p> Signup and view all the answers

<p>Conceptual ERD provides the most abstraction and least amount of detail, suitable for large projects requiring a high-level view for business analysts.</p> Signup and view all the answers

<p>Logical ERD adds more detail by defining operational and transactional entities, moving beyond the abstraction of a Conceptual ERD.</p> Signup and view all the answers

<p>Physical ERD serves as the actual design or blueprint of the database, including technical details like cardinalities and primary/foreign keys.</p> Signup and view all the answers

<p>Ordinality specifies the minimum number of relationships, while cardinality specifies the maximum number of relationships.</p> Signup and view all the answers

<p>Conceptual ERD offers a high-level, abstract view that is ideal for business analysts working on large projects.</p> Signup and view all the answers

<p>Logical ERD defines operational and transactional entities that are not included in the Conceptual ERD.</p> Signup and view all the answers

<p>Physical ERD serves as the blueprint of the database, including technical details, while Logical ERD focuses on defining operational entities.</p> Signup and view all the answers

<p>Physical ERD includes technical details like cardinalities and primary/foreign keys, which are not present in a Conceptual ERD.</p> Signup and view all the answers