shortest-distance-in-a-line

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613. Shortest Distance in a Line (Easy)

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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