select v.id as vehicleId,v.monitorType, v.brand, o.id as id,o.param_id as settingParamId,o.command_type from ( SELECT car.id id, car.brand brand, '1' monitorType,car.create_data_time FROM zw_m_vehicle_info car WHERE car.flag=1 UNION ALL SELECT peo.id id, peo.people_number brand,'3' monitorType,peo.create_data_time FROM zw_m_people_info peo WHERE peo.flag=1 UNION ALL SELECT th.id id, th.thing_number brand,'2' monitorType,th.create_data_time FROM zw_m_thing_info th WHERE th.flag=1 ) v left join ( select m.id,m.param_id,m.command_type,m.vid from zw_m_realtime_command_setting m, (select command_type,vid,MAX(CREATE_data_time)mx_time from zw_m_realtime_command_setting where flag=1 and command_type = #{commandType} and vid in #{item} GROUP BY command_type,vid )tmp where m.vid = tmp.vid and m.command_type = tmp.command_type and m.flag =1 and m.create_data_time = tmp.mx_time ) o on o.vid = v.id where v.id in #{item}