id, organ_id, username, board_id, study_time, num, content, images, create_time SELECT i.*,e.`name` board_name,u.user_name name FROM t_interaction i left join exhibition_board e on e.id = i.board_id left join t_user u on u.id = i.user_id where i.organ_id =#{orgId} order by i.create_time desc