Table: Point
+-------------+------+ | Column Name | Type | +-------------+------+ | x | int | +-------------+------+ x is the primary key column for this table. Each row of this table indicates the position of a point on the X-axis.
Write an SQL query to report the shortest distance between any two points from the Point table.
The query result format is in the following example.
Example 1:
Input: Point table: +----+ | x | +----+ | -1 | | 0 | | 2 | +----+ Output: +----------+ | shortest | +----------+ | 1 | +----------+ Explanation: The shortest distance is between points -1 and 0 which is |(-1) - 0| = 1.
Follow up: How could you optimize your query if the Point table is ordered in ascending order?