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  1. Prepare
  2. SQL
  3. Aggregation
  4. Weather Observation Station 20
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Weather Observation Station 20

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  • bharathakhil1111
     + 0 comments

    it is easy to understand

    with cte as (
select lat_n,row_number() over(order by lat_n) as rasc ,row_number() over(order by lat_n desc) as rdesc from station 
)
select CAST(lat_n AS DECIMAL(7, 4)) from cte
where abs(rasc-rdesc)<=1
order by lat_n

  • amangaur7417782
     + 0 comments
    • for sql server

    select round(count(*)/2+1,4) from station

  • emily_xqi
     + 0 comments

    with numbered as ( select , count() over() as cnt, row_number() over(order by LAT_N) as row_num from station ) select round(LAT_N, 4) from numbered where row_num in ((cnt+1)/2, (cnt+2)/2)

  • voyoga0103
     + 1 comment
    with t1 as(select LAT_N,
    row_number() over (order by LAT_N) as rn
from station),

t2 as (select count(LAT_N) as co
      from station)

select distinct
    case when mod(t2.co,2)!=0 then (select round(LAT_N,4) from t1,t2 where rn=(t2.co+1)/2)
    when mod(t2.co,2)=0 then (select round(avg(LAT_N),4) from t1,t2 where rn=t2.co/2 or rn=t2.co/2+1)
    end as median
from t1, t2;

  • malanstaton
     + 1 comment

    Simplest answer I could find:

    select distinct convert( decimal(16,4), percentile_disc(0.5) within group(order by lat_n) over() ) from station;

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