【hackerrank】Weather Observation Station 18

题目如下：

Consider  and  to be two points on a 2D plane.

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

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

Input Format

The STATION table is described as follows:

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

解题思路：用max，abs，min，format即可得到答案。

代码如下：

/*
Enter your query here.
*/
select FORMAT(ABS(a-c) + ABS(b-d),4) from
(select min(LAT_N) as a, min(LONG_W) as b,max(LAT_N) as c, max(LONG_W) as d from STATION) STA;