SELECT unit_id , book_id , unit_nm FROM unit WHERE book_id = #{bookId} INSERT INTO unit ( unit_id , book_id , unit_nm ) VALUES ( #{unitId} , #{bookId} , #{unitName} ) UPDATE unit SET unit_id = #{unitId} , book_id = #{bookId} , unit_nm = #{unitName} WHERE unit_id = #{unitId} DELETE FROM unit WHERE unit_id = #{unitId} SELECT t.text_id , u.unit_id , u.book_id , w.wd_book_id FROM unit u JOIN text t ON u.unit_id = t.unit_id JOIN wordbook w ON u.book_id = w.book_id WHERE u.book_id = #{bookId} AND u.unit_id = #{unitId};