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SELECT ROUND(AVG(LAT_N), 4) AS median
FROM (
SELECT LAT_N,
ROW_NUMBER() OVER (ORDER BY LAT_N) AS rn,
COUNT(*) OVER () AS total_count
FROM STATION
) t
WHERE rn IN (FLOOR((total_count + 1) / 2), CEIL((total_count + 1) / 2));
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Weather Observation Station 20
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SELECT ROUND(AVG(LAT_N), 4) AS median FROM ( SELECT LAT_N, ROW_NUMBER() OVER (ORDER BY LAT_N) AS rn, COUNT(*) OVER () AS total_count FROM STATION ) t WHERE rn IN (FLOOR((total_count + 1) / 2), CEIL((total_count + 1) / 2));