MIS 311 Quiz4

MIS 311 Quiz4 - Chapter 4 - Entity Relationship (ER)...

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Chapter 4 - Entity Relationship (ER) Modeling Compiled By: Mr. Irfan Ilyas TRUE/FALSE 1. Database designers must obtain a precise description of the nature of the data and the many uses of such data within an organization. ANS: T 2. The ER model is used to expand the different views of the data at the conceptual level. ANS: F 3. The Chen model is especially useful to illustrate some of the conceptual elements of database design. ANS: T 4. The Crow’s Foot model is less implementation-oriented than the Chen model. ANS: F 5. The Rein85 model is not a database model. ANS: F 6. The IDEF1X model is a database model. ANS: T 7. The word “entity” in the ER model corresponds to a table. ANS: T 8. The ER model refers to a specific table row as an entity instance. ANS: T 9. The ER model refers to a specific table row as an entity occurrence. ANS: T 10. Cardinality expresses the specific number of entity occurrences associated with one occurrence of the related entity. ANS: T 11. Attributes do not have a domain. ANS: F 12. Attributes may not share a domain.
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ANS: F 13. Cardinality expresses the specific number of entity occurrences associated with every occurrence of a related entity. ANS: F 14. In both the Chen and Crow’s Foot models, an entity is represented with a rectangle containing the entity’s name. ANS: T 15. Attributes are types of entities. ANS: F
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This note was uploaded on 07/27/2011 for the course BUS 173 taught by Professor Essiahamouda during the Winter '11 term at UC Riverside.

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MIS 311 Quiz4 - Chapter 4 - Entity Relationship (ER)...

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