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Write a query that produces as output the number of books written by authors with first names that are unique among all of the authors
Write a query that produces as output the number of books written by authors with first names that are unique among all of the authors in our database.
Point of clarification: AuthorID 1 and 6 share the first name David. David is therefore not unique among first names so the query output should exclude books written by those authors
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