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
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Databases
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.
Practise Databases
210 free Databases MCQs from Computer Science and IT, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Computer Science and IT questions like this
Computer Science and IT is on 85 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Databases questions
A primary key constraint is also called
In 3NF, a non-key attribute must not depend on a
A constraint between two attributes is called a(n)
Whenever repeating groups occur, the repeating attributes must be removed and placed
In which normalization every non-key attribute must depend on the key and all parts of the key?
A student's monthly fee changes, we must record the change in multiple receipts for student enrolled in many courses, which type of anomaly exists in this situation?