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  1. Prepare
  2. SQL
  3. Aggregation
  4. Weather Observation Station 20
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Weather Observation Station 20

  • nikovargas27
     + 0 comments

    MySQL:

    WITH numbered AS (
    SELECT 
        lat_n,
        ROW_NUMBER() OVER(ORDER BY lat_n ASC) AS index_row,
        COUNT(*) OVER () AS total_rows
    FROM station
)   

SELECT
    ROUND(AVG(lat_n), 4) AS mediana
FROM numbered
WHERE index_row IN (
    FLOOR((total_rows + 1) / 2),
    CEIL((total_rows + 1) / 2)
);