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 * from (select
least(city.id, city2.id) as id1,
greatest(city.id, city2.id) as id2
from city
join city as city2 on city.id != city2.id
group by least(city.id, city2.id), greatest(city.id, city2.id)
) as t join city as city1 on city1.id = id1 join city as city2 on city2.id = id2;
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