HackerRank MySQL - Weather Observation Station 17

Query the Western Longitude (LONG_W)where the smallest Northern Latitude (LAT_N) in STATION is greater than 38.7780. Round your answer to 4 decimal places.

SELECT *
FROM
  ( SELECT ROUND(LONG_W, 4)
   FROM STATION
   WHERE LAT_N > 38.7780
   ORDER BY LAT_N ASC)
WHERE ROWNUM = 1;