Shortest Distance in a LineTable point holds the x coordinate of some points on x-axis in a plane, whichare all integers.Write a query to find the shortest distance between two points in these points.x-102The shortest distance is '1' obviously, which is from point '-1' to '0'. So theoutput is as below:shortest1Note: Every point is unique, which means there is no duplicates in table point.Optionsselect min(abs(a.x - b.x)) as shortestfrom point as a, point as bwhere a.x == b.x;select min(abs(a.x - b.x)) as shortestfrom point as a, point as bwhere a.x != b.x;select min(abs(b.x - a.x)) as shortestfrom point as a, point as bwhere a.x != b.x;select min(abs(b.x - a.x)) as shortestfrom point as b, point as bwhere a.x == b.x;
Question
Shortest Distance in a LineTable point holds the x coordinate of some points on x-axis in a plane, whichare all integers.Write a query to find the shortest distance between two points in these points.x-102The shortest distance is '1' obviously, which is from point '-1' to '0'. So theoutput is as below:shortest1Note: Every point is unique, which means there is no duplicates in table point.Optionsselect min(abs(a.x - b.x)) as shortestfrom point as a, point as bwhere a.x == b.x;select min(abs(a.x - b.x)) as shortestfrom point as a, point as bwhere a.x != b.x;select min(abs(b.x - a.x)) as shortestfrom point as a, point as bwhere a.x != b.x;select min(abs(b.x - a.x)) as shortestfrom point as b, point as bwhere a.x == b.x;
Solution
The correct option to find the shortest distance between two points in the table is:
select min(abs(a.x - b.x)) as shortest
from point as a, point as b
where a.x != b.x;
This SQL query works by comparing every point with every other point in the table. The abs(a.x - b.x) part calculates the absolute difference between the x coordinates of two points, which is the distance between them on the x-axis. The min function then returns the smallest of these distances. The where a.x != b.x part ensures that a point is not compared with itself.
Similar Questions
Table point_2d holds the coordinates (x,y) of some unique points (more than two) in a plane.Write a query to find the shortest distance between these points rounded to 2 decimals.xy-1-100-1-2The shortest distance is 1.00 from point (-1,-1) to (-1,2). So the output should be:shortest1.00Note: The longest distance among all the points are less than 10000.Optionsselect round(min(dist), 2) as shortestfrom ( select if(a.x = b.x and a.y = b.y, 10000, sqrt(power(a.x - b.x, 2) as dist from point_2d as a, point_2d as b) as d;select round(dist) as shortestfrom ( select if(a.x = b.x and a.y = b.y, 10000, sqrt(power(a.x - b.x, 2) + power(a.y - b.y, 2))) as dist from point_2d as a, point_2d as b) as d;select round(min(dist), 2) as shortestfrom ( select if(a.x = b.x and a.y = b.y, 10000, sqrt(power(a.x - b.x, 2) + power(a.y - b.y, 2))) as dist) as d;select round(min(dist), 2) as shortestfrom ( select if(a.x = b.x and a.y = b.y, 10000, sqrt(power(a.x - b.x, 2) + power(a.y - b.y, 2))) as dist from point_2d as a, point_2d as b) as d;
Shortest Distance in a PlaneTable point_2d holds the coordinates (x,y) of some unique points (more than two) in a plane.Write a query to find the shortest distance between these points rounded to 2 decimals.xy-1-100-1-2The shortest distance is 1.00 from point (-1,-1) to (-1,2). So the output should be:shortest1.00Note: The longest distance among all the points are less than 10000.Optionsselect round(min(dist), 2) as shortestfrom ( select if(a.x = b.x and a.y = b.y, 10000, sqrt(power(a.x - b.x, 2) + power(a.y - b.y, 2))) as dist from point_2d as a, point_2d as b) as d;select round(min(dist), 2) as shortestfrom ( select if(a.x = b.x and a.y = b.y, 10000, sqrt(power(a.x - b.x, 2) as dist from point_2d as a, point_2d as b) as d;select round(dist) as shortestfrom ( select if(a.x = b.x and a.y = b.y, 10000, sqrt(power(a.x - b.x, 2) + power(a.y - b.y, 2))) as dist from point_2d as a, point_2d as b) as d;select round(min(dist), 2) as shortestfrom ( select if(a.x = b.x and a.y = b.y, 10000, sqrt(power(a.x - b.x, 2) + power(a.y - b.y, 2))) as dist) as d;
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