0613. Shortest Distance in a Line

https://leetcode.com/problems/shortest-distance-in-a-line

Description

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?

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