Entity-Relationship (E-R) Model
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Questions and Answers

What is the main purpose of the Entity-Relationship Model (ER Model)?

  • To store and manage user interface data
  • To visualize database records
  • To perform complex data calculations
  • To represent the structure and relationships of entities within a system (correct)

In the Entity-Relationship Model (ER Model), what are entities?

  • Data manipulation techniques
  • Storage units for database information
  • Objects or concepts within a system worth storing data about (correct)
  • Database administrators

What are attributes in the context of the Entity-Relationship Model (ER Model)?

  • Properties or characteristics of an entity (correct)
  • Data storage formats
  • Database server locations
  • User interface design elements

Why are primary keys important in the context of entities?

<p>They uniquely identify each entity (C)</p> Signup and view all the answers

What do relationships establish in the Entity-Relationship Model (ER Model)?

<p>Connections between entities (D)</p> Signup and view all the answers

What benefits does the Entity-Relationship Model (ER Model) offer?

<p>Improved data organization, enhanced data integrity, efficient database design, and simplified database maintenance. (B)</p> Signup and view all the answers

What do Entity Relationship Diagrams (ER Diagrams) use to represent entities?

<p>Rectangles (D)</p> Signup and view all the answers

In Entity Relationship Model, what does cardinality refer to?

<p>Number of occurrences or instances of one entity that are associated with the occurrences of another entity (D)</p> Signup and view all the answers

Which symbol represents a basic entity in ER Diagrams?

<p>Rectangle (C)</p> Signup and view all the answers

What does a weak entity inherit in the Entity Relationship Model?

<p>Identifier of its parent entity (D)</p> Signup and view all the answers

How are multi-valued attributes represented in ER Diagrams?

<p>Double oval (B)</p> Signup and view all the answers

What is the purpose of derived attributes in ER Diagrams?

<p>Logically derived from any other attribute (B)</p> Signup and view all the answers

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