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In MySQL,
with rn as (select row_number() over (order by lat_n) as rownumber, lat_n, count(*) over() as c from station)
select round(avg(lat_n),4) from rn
where rownumber in ((c/2) + 1, (c+1)/2) ;
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Weather Observation Station 20
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In MySQL, with rn as (select row_number() over (order by lat_n) as rownumber, lat_n, count(*) over() as c from station) select round(avg(lat_n),4) from rn where rownumber in ((c/2) + 1, (c+1)/2) ;