sql server 数据排名

SELECT c.sheng ,m.city, RANK() OVER (ORDER BY round(avg(cast(indexs as float)),3)) AS px,
         round(avg(cast(pm25 as float)),0) pm25, round(avg(cast(pm10 as float)),0) pm10, round(avg(cast(co as float)),3) co, 
        round(avg(cast(no2 as float)),0) no2, round(avg(cast(so2 as float)),0) so2,round(avg(cast(o3_8 as float)),0) o3_8,round(avg(cast(indexs as float)),3) indexs,round(avg(cast(aqi as float)),0) aqi
          FROM monitor_city_hour m,cd_city c
          where m.city=c.city and
          datetime=‘2017-03-04 12:00:00‘ and aqi!=0 and pm25!=0 and pm25 is not null
          group by c.sheng,m.city
          order by indexs

 select fdate time,px,aqi from(
        SELECT fdate,city,RANK() OVER (partition by fdate ORDER BY aqi) AS px,aqi
          FROM monitor_city_day 
          where  aqi!=0 and pm25!=0 and pm25 is not null
          and cast(fdate as datetime)>=cast(‘2017-02-01‘ as datetime) and
          cast(fdate as datetime)<=cast(‘2017-03-05‘ as datetime)
          )a where city=‘北京‘
          order by cast(fdate as datetime)