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Which one of the following method is used to retrieve the number of rows affected by an INSERT, UPDATE, or DELETE query?
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- changed_rows()
- new_rows()
- num_rows()
- affected_rows()
- None of these
Correct Option: D
The method num_rows() is only useful for determining the number of rows retrieved by a SELECT query. But to retrieve the number of rows affected by INSERT, UPDATE, or DELETE query, use affected_rows().
