Database Systems: Design, Implementation, Management, Loose-leaf Version
12th Edition
ISBN: 9781305866799
Author: Coronel, Carlos; Morris, Steven
Publisher: Course Technology
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Chapter 15, Problem 17RQ
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Document Type Definition (DTD) and its usage:
Document Type Definition is an organization specification of an Extensible Management Language (XML) document with the extension “.dtd”.
- It is used in describing the structure and attributes of a XML document...
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A Dia file has been created for you to extend and can be found on Company.dia represents a completed ER schema which, models some of the information implemented in the system, as a starting point for this exercise.
Understanding the ER schema for the Company database.
To demonstrate that you understand the information represented by the schema, explain using EMPLOYEE, DEPARTMENT, PROJECT and DEPENDENT as examples:
attributes, entities and relationships
cardinality & participation constraints on relationships
You should explain questions a and b using the schema you have been given to more easily explain your answers.
Creating and Extending Entity Relationship (EER) Diagrams.
To demonstrate you can create entity relationship diagrams extend the ER as described in Company.dia by modelling new requirements as follows:
Create subclasses to extend Employee. The employee type may be distinguished further based on the job type (SECRETARY, ENGINEER, MANAGER, and TECHNICIAN) and based…
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Database Systems: Design, Implementation, Management, Loose-leaf Version
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