程序IT圈
解题
# Write your MySQL query statement below
select round(min(sqrt(power(p1.x-p2.x, 2)+power(p1.y-p2.y, 2))), 2) shortest
from point_2d p1, point_2d p2
where p1.x < p2.x or (p1.x = p2.x and p1.y != p2.y)
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