Which anomaly occurs when a record is updated in the relation?
Correct answer: C. Update anomaly
- A. Good data
- B. Data integrity
- C. Update anomaly
- D. Normalization
Explanation
Update anomaly refers to a situation in a database where modifying a record can lead to data inconsistency or redundancy. This happens when the same data is duplicated across multiple tables, and updating one instance of the data might not be reflected in all the other locations. In conclusion, update anomaly is a specific type of anomaly that occurs when updating data in a poorly designed database schema, leading to inconsistencies. Normalization helps prevent update anomalies by ensuring data is stored efficiently and avoids unnecessary duplication
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Databases cover tables, records, fields, keys and relationships, together with database management systems and relational database design. The subject includes primary and foreign keys, normalization, SQL commands such as SELECT, INSERT, UPDATE and DELETE, queries, forms and reports, while distinguishing a database from a spreadsheet used for simple tabular data.
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