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SELECT ROUND(AVG(LAT_N), 4)
FROM (
SELECT LAT_N,
ROW_NUMBER() OVER (ORDER BY LAT_N) AS row_num,
COUNT(*) OVER () AS total_count
FROM STATION
) AS temp
WHERE (total_count % 2 = 0 AND row_num IN (total_count/2))
OR
(total_count % 2 = 1 AND row_num = (total_count + 1)/2);
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Weather Observation Station 20
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SELECT ROUND(AVG(LAT_N), 4) FROM ( SELECT LAT_N, ROW_NUMBER() OVER (ORDER BY LAT_N) AS row_num, COUNT(*) OVER () AS total_count FROM STATION ) AS temp WHERE (total_count % 2 = 0 AND row_num IN (total_count/2)) OR (total_count % 2 = 1 AND row_num = (total_count + 1)/2);