INSERT INTO class_book( book_id, scls_id ) VALUES (#{item.bookId}, #{item.sclsId} ) DELETE FROM class_book WHERE book_id = #{bookId} AND scls_id = #{sclsId} SELECT b.book_id, b.book_nm FROM book b JOIN class_book cb ON b.book_id = cb.book_id JOIN class c ON cb.scls_id = c.scls_id WHERE c.scls_id = #{sclsId};