Which of the following is an update anomaly?
Correct answer: C. Modification
- A. Insertion
- B. Deletion
- C. Modification
- D. All of the above
Explanation
An update anomaly occurs in a relational database when modifying data leads to inconsistencies. This happens when the same piece of information is duplicated across multiple places in the database. When that information needs to be updated, you must modify it in every location to ensure consistency. This can be time-consuming and error-prone
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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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