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ER Diagram Mapping

  1. Map the ERD, from the sample solution, into a set of relations in at least Third Normal Form (3NF). You must ensure that your relations meet 3NF. There is no need to show your
  2. Select any two (2) of your relations from the previous step, 1a), and perform the following for each of those 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 name is 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. 
  1. The primary key is StudentID. This is the only candidate key since Name is not guaranteed to 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. 
  • Name cannot be used to functionally 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 table and 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 appropriate relationships 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 the indexes follow the guidelines given in the unit
  • Populate the database with sample data of your own. You must include sufficient sample data to test your queries and report. Please note that the expected result of query questions may depend on the actual sample data

Data integrity

You are required to implement integrity constraints within the database to enforce the following requirements:

  • Insured amount should be positive currency and expressed in 2 decimals only.
  • Policy date should have appropriate date value.
  • Name of persons such as customer and assessor should not be null.
  • Each policy should be related to one property/home.

Information requests

Create queries to answer the following information requests:

Note: Do not use the Access query builder (QBE) to create your queries – you should type the queries manually using SQL view/editor.

The marking process of the queries for information requests may also consider the effectiveness of your SQL statements that have been used in the queries. It is important that your SQL statement must reflect the correct business logic & SQL syntax.  (Use enough sample data so that the output is produced by each and every query)

  1. Display the number of policies issued/created for each category of policies.
  2. Display the details of assessor(s) who has/have never performed/completed any assessment report.
  3. Display the number of settled and rejected claims.
  1. Display the details of customer(s) whose claim(s) has/have been rejected.

Note: Amongst many claims by a single customer, even if anyone claim has been rejected you need to display the details of that customer.

  1. Display the highest amount of the claim-settlement(s) that has/have been done. 
  1. Display the total amount of premium paid for each of combined Home-buildings-contents policies.

Note: The word ‘name’ is a reserved word in MS Access. Wherever you use it for SQL query, you need to put a bracket like [name].  Follow the same technique for other reserved words too.

Report

Create a simple report object showing the details of rejected claims.  The report should provide the details of claim, policy and property details in ascending order of claim date.

Hints:

  • Create a query that lists all details needed for a report. If you are unable to formulate this query, then create a report that is based directly on the table(s). [Note: you will not be able to obtain full marks for the report creation if you base your report directly on the table(s) and some criteria are not met in your reports.]
  • Use the report wizard to generate a basic report based upon your query [or the table(s) if you were unable to formulate the query].
  • Once the report wizard finishes, switch to design view and rename the labels appropriately.

Implementation Report

You must also provide a short implementation report describing your experiences with this assignment. You may discuss any of the following:

  1. Any two interesting things/procedures you learnt by doing this assignment.
  2. Any one requirement of the assignment that was relatively difficult / complex to solve but successfully completed by you.

Use the implementation report to demonstrate that you have thought carefully about the issues that arise when implementing a relational database.

What you should submit

Microsoft Access databases file containing:

  1. Tables with sample data
  2. Relationships
  3. Queries
  4. Integrity constraints
  5. Report (object).

A Microsoft Word document containing:

  1. Two relations with functional dependencies and demonstration of normalization
  2. Implementation report

Your document should contain appropriate identification information (your student number, name, unit number, etc.) and should contain the relevant headings for each section.

Important points

  • You must work individually on this assignment.
  • The model solution to this assignment will be released approximately two (2) weeks after the due date.
  • Assignments that are submitted after the release of the model solution will receive zero marks.
  • You must state in your word document the details of all materials and sources that you used to complete this assignment. This may be as simple as 'This assignment was completed using only the COIT 20247 unit materials'.
  • Extension requests (by filling in an online form) should be submitted before the assignment due date.
  • Before submitting your assignment, review the marking criteria provided on the last page of this document. Ensure that all the criteria are addressed in your submission.
  • Penalties related to late submission and plagiarism will be applied as per University policy.

The report is giving complete overview about CQI database. The database is in normalized form and it is achieved by mapping the ER diagram to the relational database. All queries, database reports etc. are generated in CQI database and the RDBMS MS Access is used in developing the CQI database.

Normalization

ER Diagram Mapping

Functional Dependency  

Person Table 

Person (FldPersonID, FldPersonName, FldStreet, FldCity, FldPostcode, FldPersonType)

FldPersonNameàFldPersonID

FldPersonTypeàFldPersonID

All fields in the Person table are relying upon the primary key Person ID.

Property Table 

Property (FldPropertyID, FldStreet, FldCity, FldPostcode, FldPersonID) 

FldStreetàFldPropertyID

FldCityàFldPropertyID

FldPostcodeàFldPropertyID

FldPersonIDàFldPropertyID

All fields in the Property table are relying upon the primary key Property ID.

Normalisation

The database is completed as normalized data. Third normal form is achieved in making the CQI database. Following steps are followed in making the 3 NF

  • Make separate tables each group of data.
  • Make unique key or primary key to identify the records.
  • Only primary key should uniquely identify the records not any other field.
  • Remove transitive dependency if any. 

All the tables in the CQI database are in 3 NF as per the rules defined above. 

(Brombarg P. n.d.)

(Janalta Interactive Inc. 2015)

SQL Queries 

Query 1

SELECT subQr1.Home_Policy as NumHomePolicy, subQr2.Home_Content_Policy as NumHomeContentPolicy FROM (SELECT Count(*) AS Home_Policy FROM Home_Building)  AS subQr1, (SELECT Count(*) AS Home_Content_Policy FROM Home_Content)  AS subQr2;

 Learning Features 

The assignment is giving so many learning features in detail-

  • Database sub queries are specified in the assignment.
  • Database queries are specified in the assignment.
  • Database reports are specified in the assignment.
  • Group by clauses are specified in the assignment.
  • Aggregate functions are specified in the assignment.
  • Normalization is specified in the assignment.

Complex Features

The assignment is having all the things in normal way. I faced some complexity in making the report and sub queries. But later I created the report by report wizard and solved the sub queries that are used in query 1 and query 3.

Conclusion

The report is giving complete overview about database normalization. It is explaining in detail about how the database should be in achieved I third normal form. Everything is shown in the report along with the all query results and database report also. 

References

Brombarg P.( n.d.). SQL SERVER Database Normalization Basics for Developers. 

Janalta Interactive Inc. (2015), Functional Dependency,

Cite This Work

To export a reference to this article please select a referencing stye below:

My Assignment Help. (2020). Student Relation's 3NF Justification And Implementation Using MS Access Essay.. Retrieved from https://myassignmenthelp.com/free-samples/coit20247-database-design-and-development/developing-database.html.

"Student Relation's 3NF Justification And Implementation Using MS Access Essay.." My Assignment Help, 2020, https://myassignmenthelp.com/free-samples/coit20247-database-design-and-development/developing-database.html.

My Assignment Help (2020) Student Relation's 3NF Justification And Implementation Using MS Access Essay. [Online]. Available from: https://myassignmenthelp.com/free-samples/coit20247-database-design-and-development/developing-database.html
[Accessed 20 June 2024].

My Assignment Help. 'Student Relation's 3NF Justification And Implementation Using MS Access Essay.' (My Assignment Help, 2020) <https://myassignmenthelp.com/free-samples/coit20247-database-design-and-development/developing-database.html> accessed 20 June 2024.

My Assignment Help. Student Relation's 3NF Justification And Implementation Using MS Access Essay. [Internet]. My Assignment Help. 2020 [cited 20 June 2024]. Available from: https://myassignmenthelp.com/free-samples/coit20247-database-design-and-development/developing-database.html.

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