355. Delete duplicate staging rows — implementation 4

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

Write the MySQL 8.0 query to delete duplicate staging rows. Assume the relevant table/columns exist.

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Answer & Explanation

4 Answers

Verified

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.

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Option C

Use a CROSS JOIN without a filter.

Additional Explanation

This option is incorrect for the stated requirement.

Verified Correct Answer

Option D

DELETE s1 FROM import_staging s1 JOIN import_staging s2 ON s1.email = s2.email AND s1.id > s2.id;

Additional Explanation

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