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SET @rn := (Select count(lat_n) from station limit 1); SELECT ROUND(lat_n, 4) AS median FROM ( SELECT lat_n, ROW_NUMBER() OVER(ORDER BY lat_n) AS rn FROM station ) AS station WHERE station.rn = @rn / 2;
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Weather Observation Station 20
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SET @rn := (Select count(lat_n) from station limit 1); SELECT ROUND(lat_n, 4) AS median FROM ( SELECT lat_n, ROW_NUMBER() OVER(ORDER BY lat_n) AS rn FROM station ) AS station WHERE station.rn = @rn / 2;