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SELECT count(c.id) FROM book_subject bs left join subject s on bs.subjectid = s.id left join catalogue c on bs.bookid=c.id WHERE s.subject = ''

error in executeQuery:
SELECT DISTINCT * FROM book_subject bs left join subject s on bs.subjectid = s.id left join catalogue c on bs.bookid=c.id WHERE s.subject = '' ORDER BY title, lastname, author LIMIT 0, 50

List of titles in subject AFRICA. Church History

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