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Questions and Answers
Which of the following is NOT a goal of data normalization?
Which of the following is NOT a goal of data normalization?
- To avoid duplication of data
- To validate and improve a logical design
- To decompose relations with anomalies
- To allow users to insert, delete, and update rows (correct)
What is the purpose of well-structured relations?
What is the purpose of well-structured relations?
- To minimize data redundancy
- To avoid anomalies (correct)
- To produce smaller relations
- To allow users to insert, delete, and update rows
What is an insertion anomaly?
What is an insertion anomaly?
- Adding new rows causes data inconsistencies
- Deleting rows may cause a loss of data needed for other future rows
- Adding new rows forces user to create duplicate data (correct)
- Changing data in a row forces changes to other rows
What is a deletion anomaly?
What is a deletion anomaly?
What is a modification anomaly?
What is a modification anomaly?
Data normalization is primarily a tool to validate and improve a logical design so that it satisfies certain constraints that avoid unnecessary duplication of ______.
Data normalization is primarily a tool to validate and improve a logical design so that it satisfies certain constraints that avoid unnecessary duplication of ______.
The process of decomposing relations with anomalies to produce smaller, ______ relations.
The process of decomposing relations with anomalies to produce smaller, ______ relations.
A relation that contains minimal data redundancy and allows users to insert, delete, and update rows without causing ______ inconsistencies.
A relation that contains minimal data redundancy and allows users to insert, delete, and update rows without causing ______ inconsistencies.
The goal of well-structured relations is to avoid ______.
The goal of well-structured relations is to avoid ______.
Example – Figure 5.2b: Is this a ______?
Example – Figure 5.2b: Is this a ______?
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