Consider the data file ‘sales.csv’, which has sales data for a fictitious company with first line showing the sales attributes (fields) and each subsequent line showing a separate sales record. Each sales record has values for sales attributes (fields).
computer science
Description
– Normalization, Transaction Management and File Organization
.
1.
Consider
the data file ‘sales.csv’, which has sales data for a fictitious company with
first line showing the sales attributes (fields) and each subsequent line
showing a separate sales record. Each sales record has values for sales
attributes (fields). You are asked to store ONLY A RELEVANT PORTION of the sales data in a relational
database which can have tables only in 3NF.
(You are reminded that a 3NF table necessarily should also be in 2NF and 1NF.)
i)
Select a subset of attributes
(fields) which you will store in your relational database and explain your
|
reasons
for your selection. |
(1) |
ii)
Create
the required database schema for the above requirements and list your database
schema as a set of relation schemas (table schemas). You are reminded that a
single relation schema (table schema) is written as shown below taking the
DreamHome.Staff relation as an example:
|
Staff
(staffNo,fName,lName,position, sex, DOB, Salary,branchNo) |
|
|
Primary Key staffNo |
|
|
Foreign Key
branchNo references Branch(branchNo) |
(4) |
|
|
|
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iii)
Explain how each relation schema in your database is in 3NF. |
(3) |
2.
Consider the following Student
table in a University Student Records database.
student
|
StudentId |
|
fName |
|
lName |
discipline |
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432987 |
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