Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
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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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