4.1 Quality data is needed for useful information to be extracted from a database - NSC Information Technology - Question 4 - 2016 - Paper 2
Question 4
4.1 Quality data is needed for useful information to be extracted from a database.
List THREE characteristics of quality data.
4.2 While testing the database one... show full transcript
Worked Solution & Example Answer:4.1 Quality data is needed for useful information to be extracted from a database - NSC Information Technology - Question 4 - 2016 - Paper 2
Step 1
List THREE characteristics of quality data.
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Accurate: The data should reflect the true state of what it represents.
Complete: All required data should be present and accounted for.
Relevant: The data must be applicable to the specific context or purpose it is being used for.
Step 2
What is an update anomaly?
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An update anomaly occurs when changes made to one piece of data do not propagate to all related data points in the database.
For instance, if an item is updated in one table but not in linked tables, it leads to inconsistencies and incomplete information.
Step 3
What is the advantage of running a DBMS on a server?
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The primary advantage is that multiple users can access and utilize the database simultaneously, ensuring data is centrally managed and secured. It enhances reliability and performance, as well as facilitates easier management of data and users.
Step 4
What is the responsibility of a database administrator?
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The database administrator is responsible for managing and maintaining the database's structure, ensuring data integrity, security, and optimal performance.
Step 5
State TWO tasks specific to the job description of a database analyst.
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Analyzing data requirements: Understanding the data needs of the organization and designing appropriate database solutions.
Creating reports: Developing comprehensive reports and queries for stakeholders to support decision making.
Step 6
Suggest a solution to scale down the size of the database without losing functionality.
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Implementing data warehousing or normalization strategies would help streamline the database structure, improving efficiency and performance while preserving essential data integrity and functionality.
Step 7
Explain why the current design of the database will not allow for the same stand to be allocated to more than one exhibitor.
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The current design enforces a one-to-many relationship between stands and exhibitors by using a primary key, StandNo, in the tblStands table, ensuring that each stand can only be linked to a single exhibitor.
Step 8
Display the stand numbers that require a plug point.
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SELECT StandNo FROM tblStands WHERE PlugPoint = True;
Step 9
Allocate an additional assistant to each stand.
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UPDATE tblStands SET Assistants = Assistants + 1;
Step 10
Remove the stand with stand number B02 from the database.
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DELETE FROM tblStands WHERE StandNo = 'B02';
Step 11
Output for the SQL statement provided.
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The output will display the CompanyName along with the count of NumStands and SumAssistants:
