两个表关联

select
supplier,module,pline,station,date,avg(detail.valuedouble)
from 
`sqm`.`sqm_value_quality_detail`  detail ,
`sqm`.`sqm_station_performance_view`  station

where detail.valuetype='double' and detail.value_station_id = station.guid
group by supplier,module,pline,station,date

原文地址:https://www.cnblogs.com/mount/p/2242602.html