Assignment # 9

due Tuesday, February 14th

 

This may be done individually OR in your Lab3 group

 

Submitted by: ______________________________________________________

 

  1. The author of our text says that a data model is like a building blueprint.  What is the advantage of making changes during the data modeling stage?

 

 

 

  1. Who is the author of the entity-relationship data model?

 

 

 

  1. Define entity

 

 

 

  1. Give an example of an entity other than one in this chapter or dicussed in class.

 

 

 

  1. Define attribute

 

 

 

  1. Given an example attribute for the entity in your answer to question 4.

 

 

 

  1. Define identifier.

 

 

 

  1. Give an example identifier for the entity in your answer to question 4.

 

 

 

  1. Explain the difference between an entity and a table?

 

 

 

  1. Why is the diffference between an entity and a table important?

 

 

 

  1. Define the term maximum cardinality.

 

 

 

  1. Define the term minimum cardinality.