77. PK inspection (Scenario 3)

DBMS Published 30 Sept 2026 Updated 28 Oct 2026 2 Views Verified

Find the primary key columns in INFORMATION_SCHEMA.

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Answer & Explanation

4 Answers

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Option A

Use a DELETE statement instead.

Additional Explanation

This option is incorrect for the stated requirement.

Verified Correct Answer

Option B

SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'employees' AND CONSTRAINT_NAME = 'PRIMARY' ORDER BY ORDINAL_POSITION;

Additional Explanation

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

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Option C

Use a CHECK for the same relationship.

Additional Explanation

This option is incorrect for the stated requirement.

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Option D

Use a SELECT without a constraint.

Additional Explanation

This option is incorrect for the stated requirement.