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create table friendships ( requester int, acceptor int, v1 int generated always as (least(requester, acceptor)), v2 int generated always as (greatest(requester, acceptor)), unique (v1, v2) );
insert into friendships(requester, acceptor) values(2, 1)
insert into friendships(requester, acceptor) values(1, 2)
Duplicate entry '1-2' for key 'friendships.v1'