id, room_name, stu_id, start, end select from t_video_student select room_name as roomName from t_video_student group by room_name DELETE FROM t_video_student; insert into t_video_student (id, room_name, stu_id, start, end) values (#{id,jdbcType=INTEGER}, #{roomName,jdbcType=VARCHAR}, #{stuId,jdbcType=VARCHAR}, #{start,jdbcType=TIMESTAMP}, #{end,jdbcType=TIMESTAMP} )