shortestDistance.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?
*/
# Write your MySQL query statement below
SELECT
    MIN(ABS(p1.x - p2.x)) AS shortest
FROM
    point p1
        JOIN
    point p2 ON p1.x != p2.x
;