Abstract
A database system consists of three components: schemas, data, and programs. Database reengineering starts with the schema, which defines the meaning of data and their relationship in different models. Only after a schema has been redefined can data and programs be reengineered into a new database system, which makes use of the translated schema. Schema translation is the process of changing a schema expressed in one data model into an equivalent schema expressed in a different data model.
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References
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Questions
Questions
Question 3.1
Translate the following network database schema to network database DDL.
Question 3.2
Translate the following hierarchical database schema into network database DDL and also into a relational schema.
Question 3.3
How can one compare the abstract level of the EER model and UML, and the features of a relational database and object-oriented database?
Question 3.4
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a.
Show the steps needed in designing an entity-relationship model. What are the steps of mapping an EER model into a relational model?
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b.
Consider a case study with the following business requirements and relational database:
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A company has two regions, A and B.
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Each region forms its own departments.
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Each department approves many trips in a year.
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Each staff makes many trips in a year.
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In each trip, a staff needs to hire cars for transportation.
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Each hired car can carry many staff for each trip.
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A staff can be either a manager or an engineer.
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The data requirements are:
Data field | Description |
|---|---|
Department_id | The identity number of department |
Salary | The salary of department staff |
Classification | The classification of regional office |
Trip_id | The identity of each business trip by department staff |
Car_model | The model of the car rented by staff during the business trip |
Staff_id | The identity number of department staff |
Name | The name of the staff who rents the car during business trip |
DOB | Date of birth of department staff |
Size | The size of the car rented by department staff for business trip |
Description | Description of the car rented by department staff on business trip |
Title | The job title of department staff on business trip |
Based on the user and data requirement, design an EER model to meet these requirements.
Question 3.5
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(a) What are the steps of mapping Unified Modeling Language into an object-oriented schema?
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(b) Map the following Unified Modeling Language into an object-oriented schema:
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(c)
Question 3.6
What is DTD-graph? How can one compare a DTD-graph with EER model?
Question 3.7
Show the steps of translating the following DTD-graph into DTD?
Question 3.8
Translate the following relational schema into an XSD such that the selected XML view is called “Factory” and the relevant relations under the root are relation Category and the other navigable relations.
Relational Schemas:
where underlined words are primary key and words with “*” prefixes are foreign keys.
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Fong, J. (2015). Schema Translation. In: Information Systems Reengineering, Integration and Normalization. Springer, Cham. https://doi.org/10.1007/978-3-319-12295-3_3
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DOI: https://doi.org/10.1007/978-3-319-12295-3_3
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