Weather Observation Station 20

Finding Median

Question Link

A median is defined as a number separating the higher half of a data set from the lower half. Query the median of the Northern Latitudes (LAT_N) from STATION and round your answer to decimal places.

Input Format

The STATION table is described as follows:

where LAT_N is the northern latitude and LONG_W is the western longitude.

SELECT ROUND(AVG(LAT_N),4)
FROM (
  SELECT 
    LAT_N, 
    ROW_NUMBER() OVER (ORDER BY LAT_N) AS row_num,
    COUNT(*) OVER () AS total_rows
  FROM STATION
) AS subquery
WHERE row_num IN (FLOOR((total_rows + 1) / 2), CEIL((total_rows + 1) / 2));