COMP 266 Lecture Notes - Lecture 2: Associative Entity

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1 Jul 2018

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Comp378 - Unit 2:

5. The entity type STUDENT has the following attributes: Student Name, Address,

Phone, Age, Activity, and No of Years. Activity represents some campus-based student

activity, and No of Years represents the number of years the student has engaged in this

activity. A given student may engage in more than one activity. Draw an ERD for this

situation. What attribute or attributes did you designate as the identifier for the

STUDENT entity? Why?

6. Are associative entities also weak entities? Why or why not? If yes, is there

anything special about their “weakness”?

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