Juan Daniel Santana Rodés <jdsantana@estudiantes.uci.cu> wrote:
> I am developing a task in which I need to know how to compare the
> results of two queries ...
> I thought about creating a procedure which both queries received by
> parameters respectively. Then somehow able to run queries and return if
> both have the same result. As a feature of the problem, both queries are
> selection.
Maybe something roughly like this?:
create or replace function rscmp(qry1 text, qry2 text)
returns boolean
language plpgsql
as $$
declare
c int;
begin
execute 'select count(*) from ('
|| qry1
|| ') rs1 full join ('
|| qry2
|| ') rs2 on rs1 = rs2 where rs1 is not distinct from null or rs2 is not distinct from null'
into c;
return (c = 0);
exception
when sqlstate '42804' then return false;
end;
$$;
--
Kevin Grittner
EDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
