Weather Observation Station 20

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    WITH ORDERLIST AS( SELECT LAT_N, ROW_NUMBER() OVER (ORDER BY LAT_N) AS ROWASC, ROW_NUMBER() OVER (ORDER BY LAT_N DESC) AS ROWDESC FROM STATION ),

    MEDIANS AS( SELECT LAT_N FROM ORDERLIST WHERE ROWASC=ROWDESC OR ROWASC +1 = ROWDESC ) SELECT ROUND (AVG(LAT_N * 1.0),4)AS MEDIAN FROM MEDIANS;