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create table city( id int auto_increment, name varchar(100), primary key (id) ); insert into city(name) values('москва'), ('якутск'), ('саратов'); select LEAST(city.name, city1.name), GREATEST(city.name, city1.name) from city inner join city as city1 on city1.id != city.id GROUP BY LEAST(city.name, city1.name), GREATEST(city.name, city1.name);
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