relational division

product.sql

create table a (x integer);
create table b (y integer);
insert into a values (1);
insert into a values (2);
insert into b values (1);
insert into b values (2);
insert into b values (3);


select * from a,b;

-- result:
-- 1|1
-- 1|2
-- 1|3
-- 2|1
-- 2|2
-- 2|3