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SELECT
ROUND(ABS(A - C) + ABS(B - D),4) AS MD
FROM (
SELECT
MIN(LAT_N) AS A,
MAX(LAT_N) AS C,
MIN(LONG_W) AS B,
MAX(LONG_W) AS D
FROM STATION
) AS sub;
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Weather Observation Station 18
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SELECT ROUND(ABS(A - C) + ABS(B - D),4) AS MD FROM ( SELECT MIN(LAT_N) AS A, MAX(LAT_N) AS C, MIN(LONG_W) AS B, MAX(LONG_W) AS D FROM STATION ) AS sub;