305. Normalize emails — implementation 3

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

Write the MySQL 8.0 query to normalize emails. Assume the relevant table/columns exist.

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Answer & Explanation

4 Answers

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Option A

Use SELECT instead of the required operation.

Additional Explanation

This option is incorrect for the stated requirement.

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Option B

Use TRUNCATE for only the matching rows.

Additional Explanation

This option is incorrect for the stated requirement.

Verified Correct Answer

Option C

UPDATE customers SET email = LOWER(TRIM(email)) WHERE email IS NOT NULL;

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 D

Use a CROSS JOIN without a filter.

Additional Explanation

This option is incorrect for the stated requirement.