https://www.hackerrank.com/challenges/weather-observation-station-18/problem

📔문제

Consider P1(a,b) and P2(c,d) to be two points on a 2D plane.

• a happens to equal the minimum value in Northern Latitude (LAT_N in STATION).
• b happens to equal the minimum value in Western Longitude (LONG_W in STATION).
• c happens to equal the maximum value in Northern Latitude (LAT_N in STATION).
• d happens to equal the maximum value in Western Longitude (LONG_W in STATION).

Query the Manhattan Distance between points P1 and P2 and round it to a scale of 4 decimal places.

The STATION table is described as follows:

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

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🧮분야

• AGGREGATION

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📃SQL 코드

select round(abs(c-a)+abs(d-b),4)
from (select min(lat_n) a
     from station),
     (select min(long_w) b
     from station),
     (select max(lat_n) c
     from station),
     (select max(long_w) d
     from station);

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📰출력 결과

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📂고찰

맨해튼 거리는 |c-a|+|d-b|로 구할 수 있다.