Leetcode 612. 平面上的最近距离

select round(
        pow(pow(p1.x-p2.x,2)+pow(p1.y-p2.y,2),1/2),2
    ) shortest
    from point_2d p1
    inner join point_2d p2
    where p1.x<>p2.x
         or p1.y<>p2.y
    order by 1 asc
    limit 1