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with c1 as
(select , dense_rank() over (order by lat_n) as rnk from station)
select round(lat_n,4) from c1 where rnk=(select (count()+1)/2 from station);
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Weather Observation Station 20
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with c1 as (select , dense_rank() over (order by lat_n) as rnk from station) select round(lat_n,4) from c1 where rnk=(select (count()+1)/2 from station);