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Chapter 7: Problem 11

A college or university will keep track of several addresses for a student, but each of these can be named differently: for example, consider that a student has a mailing address and a home address. Create an ERD for a student entity type with two composite attributes for student addresses where each comprises several single-valued attributes.

Short Answer

Expert verified
The Entity-Relationship Diagram can be drawn as follows: The 'Student' entity is connected to the 'Has' relationship. The 'Has' relationship then connects to two composite attributes: 'Home Address' and 'Mailing Address'. Each composite attribute is further divided into smaller single-valued attributes, effectively illustrating the structure and relationships of the data.

Step by step solution

01

Identify Entities

First, identify the main entities that exist within the problem. The primary entity in this case is 'Student'.
02

Identify Relationships

Next, identify the relationships that link the entities together. Every 'Student' has multiple 'Addresses', hence the relationship that is established is 'Has'
03

Define Composite Attributes

The 'Student' entity has composite attributes for different addresses i.e. 'Home Address' and 'Mailing Address'. Each of these composite attributes can be broken down into single-valued attributes. For instance, both 'Home Address' and 'Mailing Address' can be divided into sub-attributes like 'Street', 'City', 'State', and 'ZIP Code'.
04

Draw the ERD

Draw the 'Student' entity as a rectangle. Label the relationship 'Has' as a diamond and connect it to the 'Student' entity with a line. Then, illustrate the composite attributes ('Home Address' and 'Mailing Address') as ovals and connect them to the 'Has' relationship. Lastly, draw the single-valued attributes as smaller ovals connected to their relevant composite attribute.

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