The import of plants can be dangerous as the plants may be invasive or introduce diseases to native plants and ecosystems - NSC Information Technology - Question 4 - 2020 - Paper 2
Question 4
The import of plants can be dangerous as the plants may be invasive or introduce diseases to native plants and ecosystems. A rigid testing process must first be cond... show full transcript
Worked Solution & Example Answer:The import of plants can be dangerous as the plants may be invasive or introduce diseases to native plants and ecosystems - NSC Information Technology - Question 4 - 2020 - Paper 2
Step 1
4.1.1 State TWO specific requirements relevant to the content of a primary key field.
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Answer
The data in the field of the primary key must be unique, meaning there cannot be any duplicates.
The primary key field cannot be null or empty; every record must have a valid identifier.
Step 2
4.1.2 (a) Identify a suitable foreign key and give the name of the field and the name of the table that contains the field.
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A suitable foreign key would be ImporterID, which is found in the tblApplications table. This field links to the primary key in the tblImporters table.
Step 3
4.1.2 (b) Name the type of relationship between tables tblImporters and tblApplications.
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The type of relationship is a 'One to Many' relationship, as one importer can have multiple applications associated with them.
Step 4
4.1.3 Name the diagram used to illustrate the relationship between the two tables.
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The diagram used is known as an Entity Relationship Diagram (ERD).
Step 5
4.2 Suggest a more appropriate data type for the Approved field in the tblApplications table.
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A more appropriate data type for the Approved field would be a Boolean type, which allows for clear representation of true/false values.
Step 6
4.3 Explain why the ProcessedDuration field in the tblApplications table is redundant.
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The ProcessedDuration field is redundant because it can be calculated as the difference between the DateProcessed and DateReceived fields. Therefore, it duplicates information that can be derived from existing data.
Step 7
4.4.1 Explain what is meant by the term beta version.
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A beta version refers to a version of software that is released for testing purposes. It is typically tested by a limited number of users to help identify bugs and gather feedback before the official release.
Step 8
4.4.2 Suggest a way in which the system can be adapted so that the name of a country is captured uniformly in the ImporterCountry field.
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To ensure uniformity, a dropdown list or a standard set of options can be provided in the ImporterCountry field, limiting user input to predefined country names.
Step 9
4.5.1 Data validation.
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Data validation involves ensuring that the data entered in the Approved field is either 0 or 1. This can include using validation rules or range checks to enforce acceptable values.
Step 10
4.5.2 Data verification.
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Data verification is the process of checking the correctness of the data against a reliable source or human perspective to confirm its accuracy.
Step 11
4.6 Suggest any TWO physical ways in which access to the database server can be restricted.
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Physical access controls can be implemented by using biometric security methods, like fingerprint access, to restrict entry to authorized personnel only.
Servers can be secured in locked rooms with access limited to authorized staff, employing additional security measures.
Step 12
4.7.1 Explain the term data independence.
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Data independence refers to the capacity to modify the database structure without needing to change the applications that are using the database. It separates the data from the software that manages it.
Step 13
4.7.2 Name any ONE other area of data independence.
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One area of data independence is logical independence, which allows changes to the logical structure of the database (such as adding new fields) without altering existing applications.
Step 14
4.7.3 Any TWO.
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The user software/application cannot alter the structure or format of data, ensuring that the data remains intact.
Multiple applications can interface the same data because the physical structure is not tied to the database, increasing flexibility and usability.
