fa‌‌‍‍‌‍‍‌‍‌‍‍‌‌‌‌‌‌‌‍‌‌‍‍‌‌‌‍‌‌‌‍cebook DS面试题

请问下，

Given data on Facebook members friending/defriending each other on Facebook, find out whether a given pair of members are currently friends.

可以用sql做么？

如何解呢