Photo AI
A small local business operating from a single site store their business data in a database with two tables called tblClients and tblOrders - NSC Information Technology - Question 4 - 2019 - Paper 2
Question 4
A small local business operating from a single site store their business data in a database with two tables called tblClients and tblOrders. The table design for th... show full transcript
Worked Solution & Example Answer:A small local business operating from a single site store their business data in a database with two tables called tblClients and tblOrders - NSC Information Technology - Question 4 - 2019 - Paper 2
Step 1
4.1 No primary key is indicated.
Answer
In database design, a primary key is essential as it uniquely identifies each record in a table. In this case, the absence of a primary key in tblClients and tblOrders could lead to issues such as duplicate entries and difficulty in data retrieval. It is crucial to have the ClientSAID as the primary key for tblClients and InvoiceNumber for tblOrders to maintain data integrity.
Step 2
4.2 Suggest a data validation technique that can be used to enforce this condition.
Answer
A range check validation rule can be applied to ensure that only orders with a value of R500.00 or more are entered into the tblOrders table. This can be implemented by setting a constraint on the Amount field within the input form or database layer.
Step 3
Step 4
4.3.2 Identify the type of relationship which will be formed AND indicate the table that will appear on each side of the relationship.
Answer
The relationship that will be formed is a One-to-Many relationship. tblClients will be on the one side, and tblOrders will be on the many side, as one client can have multiple orders.
Step 5
4.4 Evaluate why this suggestion would lead to a poor table design.
Answer
Adding the ClientAge field to the tblClients table could lead to data redundancy, as the client's age can be derived from their ClientSAID. This duplication could complicate data management and increase the risk of inconsistencies, thus making the table design less efficient.
Step 6
4.5 Suggest whether the business should use a desktop or server database management system. Motivate your answer.
Answer
The business should use a Server DBMS as it offers scalability and better accessibility, which would be beneficial if the business expands or requires remote access to the database. A Server DBMS can manage multiple users efficiently, unlike a Desktop DBMS that would be limited in terms of user access and data management.
Step 7
Step 8
4.6.2 Name the database design concept related to the error message above.
Answer
The database design concept related to this error message is Referential Integrity. It ensures that relationships between tables are preserved and that foreign keys must match primary keys in the related tables.
Step 9
Step 10
Step 11
4.9 What is meant by the term invisible data capturing?
Answer
Invisible data capturing refers to the process of collecting personal or sensitive information about individuals without their explicit knowledge or consent. This can happen through various means, including tracking online behavior or extracting data without transparency.
Step 12
4.10 Explain the concept of data mining.
Answer
Data mining is the practice of analyzing large sets of data to discover patterns, trends, and insights that can be used to inform decision-making. It involves various techniques, including statistical analysis, machine learning, and data visualization.
Step 13
4.11 Briefly discuss how an audit trail can be used to assist the auditing firm in their investigation.
Answer
An audit trail is a chronological record of changes made to data, which can be utilized by auditors to trace back through the data history. This assists in verifying the accuracy of transactions and ensuring compliance with financial regulations.
Step 14
4.12 Explain how record locking works.
Answer
Record locking is a mechanism used to prevent simultaneous updates to the same record by multiple users. When a record is being edited, it is 'locked' to other users until the changes are saved or canceled, ensuring data integrity and reducing conflicts.