Answer
Define the term nonunique key and give an example.
A nonunique key not only identifies a row, but it potentially identifies more than one row. In the above example, we discussed the table: EXAMPLE: TEXTBOOK (ISBN, Title, Publisher, Copyright)
In this case, a nonunique key would be Publisher. Many books are tied to the same publisher, so it cannot uniquely identify a row, and could be related to many rows in the table.
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