I'm not the strongest on SQL, but I think you can use 'in' to solve your problem i.e.
in reply to Many-to-many relationships in databases : SOLVED
SELECT book FROM BooksAuthors WHERE Author in ('Jones', 'Smith');
SQL syntax may not be perfect - not my main field of expertise
Also look at SQL::Abstract and the extension to Class::DBI that uses it, Class::DBI::AbstractSearch, for an easy way to build these queries dynamically using perl data structures, for any length list of authors.
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