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COIT20247 : Database Design And Development

tag 0 Download 4 Pages / 806 Words tag 07-11-2020

Question:

1). Normalization
 
a). Map the ERD, from the sample solution, into a set of relations in at least Third Normal Form (3NF). You must ensurethat your relations meet 3NF. There is no need to show your
 
b). Select any two (2) of your relations from the previous step, 1a), and perform the following for each ofthose two relations:
 
List all the functional dependencies exist in the
 
Demonstrate that the relation meets Third Normal Form (3NF).

For your help, an example for a Student relation’s 3NF justification has been provided below:

STUDENT (StudentID, Name, Address, DateOfBirth)

1). The primary key is StudentID which identifies a student.  There will be one student name per Student ID because only one nameis recorded for each student. Even though a student may have multiple addresses (e.g. a home address and a work address), the case study states that there is a need to record the home address only and hence there will be only one address for each student. There will be only one date of birth for each student.  Thus, there are no repeating groups. Hence, this relation is in 1NF.

2). The primary key is StudentID.  This is the only candidate key since Name is not guaranteedto be unique (two different students may have the same name).  Address is also not guaranteed to be unique. This means that Student ID functionally determines every other attribute in the table.  There is a single valued simple candidate key (StudentId) and therefore no partial dependencies are possible.  Hence, the relation is in 2NF.

 3). Name cannot be used tofunctionally determine any other attribute in the table since two different students may have the same name; likewise for address and date of birth. Therefore there are no transitive dependencies in the table.  Therefore it meets the requirements of first, second and third normal 

2 Relational database implementation

Note: Use the relations that you created in the above step 1-Normalization to create a database. The recommended tool for this work is Microsoft Access, version 2010 or later. One reason for recommending Microsoft Access is that your unit lecturer/tutor will be able to provide adequate support to you in the use of this tool. If you choose to use a different DBMS, then there is no guarantee that your lecturer/tutor will be able to provide enough support to you.  The remainder of this document assumes that you are using MS-Access.

In implementing the ER model provided, you must complete the following tasks:

  • Create all the relations in a Microsoft Access database. Consider each attribute in every tableand make appropriate choices regarding data types & sizes, indexes, required/not required and validation rules. Your choices should be appropriate for each attribute and should support data integrity. (Note: see the Data Integrity section below for specific data integrity requirements)
  • Create relationships as appropriate. Enforce referential integrity for all appropriaterelationships in the database. Apply cascade update and/or delete options wherever necessary.
  • Review the default index created by Access for each table. You should ensure that theindexes follow the guidelines given in the unit 
  • Populate the database with sample data of your own. You must include sufficient sample data to testyour queries and report.  Please note that the expected result of query questions may depend on the actual sample data 
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Total 4 pages

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My Assignment Help (2020) Database Design And Development [Online]. Available from: https://myassignmenthelp.com/free-samples/coit20247-database-design-and-development/attributes-are-dependent-on-the-claimid.html
[Accessed 10 August 2022].

My Assignment Help. 'Database Design And Development' (My Assignment Help, 2020) <https://myassignmenthelp.com/free-samples/coit20247-database-design-and-development/attributes-are-dependent-on-the-claimid.html> accessed 10 August 2022.

My Assignment Help. Database Design And Development [Internet]. My Assignment Help. 2020 [cited 10 August 2022]. Available from: https://myassignmenthelp.com/free-samples/coit20247-database-design-and-development/attributes-are-dependent-on-the-claimid.html.


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