Shortest Distance in a Line

Similar Problems:

- Review: SQL Problems
- Tag: #sql

Table point holds the x coordinate of some points on x-axis in a plane, which are all integers.

Write a query to find the shortest distance between two points in these points.

| x | |-----| | -1 | | 0 | | 2 |

The shortest distance is ‘1’ obviously, which is from point ‘-1’ to ‘0’. So the output is as below:

| shortest| |---------| | 1 |

Note: Every point is unique, which means there is no duplicates in table point.

Follow-up: What if all these points have an id and are arranged from the left most to the right most of x axis?

Github: code.dennyzhang.com

Credits To: leetcode.com

Leave me comments, if you have better ways to solve.

## Blog link: https://code.dennyzhang.com/shortest-distance-in-a-line select t1.x-t2.x as shortest from point as t1 join point as t2 where t1.x>t2.x order by (t1.x-t2.x) asc limit 1

Share It, If You Like It.