94. update anomaly — example 2

DBMS Published 30 Sept 2026 Updated 30 Sept 2026 0 Views Verified

What is an update anomaly?

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Answer & Explanation

4 Answers

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Option A

An index with no rows.

Additional Explanation

This option is incorrect for the stated requirement.

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Option B

A query that always returns one row.

Additional Explanation

This option is incorrect for the stated requirement.

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Option C

A failed SELECT syntax only.

Additional Explanation

This option is incorrect for the stated requirement.

Verified Correct Answer

Option D

The same fact is stored in multiple rows and changing it requires multiple updates, creating a risk of inconsistent copies.

Additional Explanation

Correct implementation. Prefer parameterized queries in application code, validate affected rows for UPDATE/DELETE, and use transactions for related writes.