127. cardinality — scenario 1

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

What does cardinality describe in ER modeling?

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Answer & Explanation

4 Answers

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Option A

The number of indexes only.

Additional Explanation

This option is incorrect for the stated requirement.

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Option B

The table's disk size only.

Additional Explanation

This option is incorrect for the stated requirement.

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Option C

The SQL keyword count.

Additional Explanation

This option is incorrect for the stated requirement.

Verified Correct Answer

Option D

It describes how many instances of one entity may be associated with instances of another.

Additional Explanation

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