求滑动平均

臭氧的滑动平均

select FID,version,fsiteid,fDATETIME,
case when (count(fO3) OVER (partition by fsiteid order by fDATETIME RANGE  interval '7' hour preceding ))>5 then (avg(fO3) OVER (partition by fsiteid order by fDATETIME RANGE  interval '7' hour preceding )) else null end O3_8H
from DQ_hour_data_tb;