Coit20247 Database Design And Development-The Assessment Answers
b) 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 relation.
• 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)
i. 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.
ii. 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.
iii. 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 normalform.
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 textbook.
• 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 populated.
Answer:
Client (ClientID, FullName, Address, Phone, Level)
Car (RegNo, ClientID, Model, Maker, Color, ProducedYear, CarPrice, WarrantyPeriod)
Service (JobNo, Description, ServiceDate, TotalCost)
EmployeeType (EmployeeTypeID, Type, Desc)
Employee (EmployeeID, FullName, Address, Phone, EmployeeTypeID)
LabourWork (EmployeeID, JobNo, StartTime, FinishTime, LabourCost)
Complaint (ComplaintID, JobNo, Reason, LodgedDate, Outcome)
PartType (PartID, PartDescription, PricePerUnit)
PartUsed (JobNo, PartID, QuantityUsed, PartCost)
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Functional dependencies
Client (ClientID, FullName, Address, Phone, Level)
The essential key is ClientID which distinguishes a customer and customer name per clienID. The customers may have many address. Be that as it may, the framework bolster just to store one address. Same as the address the customer likewise have many telephone number, however just a single number can be put away in to the framework. The customer can have one level. Consequently, this connection is in the 1NF.
The essential key is ClientID. Clint have a name, one address and one telephone Number science these are not ensured to be special. Its methods the clientID decide each trait of the tables. Along these lines, no reliance is impractical in this table. So this is in 2NF.
Two diverse customer can have a similar name, address and telephone number, accordingly, no transitive reliance is available in this table. This connection meets first, second, and third standardization rules.
The substances that are to be utilized for portrayal in this report are customer and Car
The Functional Dependencies for the Car table is given beneath:
Auto (RegNo, Model, Maker, Color, ProducedYear, CarPrice, WarrantyPeriod)
The Car table has RegNo as the basic key and every one of the information with respect to the clients can be acquired from the client table by using the RegNo. In this way the 3NF institutionalization for the association is in like manner took care of gainfully. The Model, Maker, Color, ProducedYear, CarPrice and WarrantyPeriod express the transitive dependence for the table and moreover the data redundancy and the data duplication issues can similarly be settled successfully by the table.
2.Relational Database Implementation
The relational database would be implemented in MS Access.
3.Interesting procedure that were learnt during the course of this assignment
- One of the to a great degree interesting thought regarding the database that was discovered all through this assignment was that of the report and the sub report. It is particularly compelling to consolidate a sub report inside a repost that gives the information on various sort of data for the assignment.
- Moreover date was furthermore gotten the hang of all through this undertaking. The DateAdd() system and the Date() Methods were to a great degree capable for getting assorted sorts of results for the data bringing requirements of this errand. In addition, the present data bringing process Now() was also outstandingly beneficial and besides empowered the inquiries to obtain the present date and time of the machine.
4.The most complex task in the assignment
The most complex errand in this task was setting the compels for the enrollment number of the autos for the customers. This methodology includes the utilization of information veil that was generally new and consumed a great deal of time before usage. Henceforth, this is believed to be the most complex process in the entire task.
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