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create table friends_relations ( buddy_id varchar(255) not null, mate_id varchar(255) not null, constraint uq1 unique ((least(buddy_id, mate_id)), (greatest(buddy_id, mate_id))), primary key (buddy_id, mate_id) );
insert into friends_relations (buddy_id, mate_id) values (456, 123);
insert into friends_relations (buddy_id, mate_id) values (123, 456);
Duplicate entry '123-456' for key 'friends_relations.uq1'