SELECT * FROM ai_lms.user_class SELECT * FROM ai_lms.user_class WHERE std_id = #{stdId} INSERT INTO ai_lms.user_class (std_id, user_id, scls_id, stn_qna, file_mng_id) VALUES (#{stdId}, #{userId}, #{sclsId}, #{stnQna}, #{fileMngId}) UPDATE ai_lms.user_class SET stn_qna = #{stnQna}, file_mng_id = #{fileMngId} WHERE std_id = #{stdId} DELETE FROM ai_lms.user_class WHERE std_id = #{stdId}