From: | Kevin Grittner <kgrittn(at)ymail(dot)com> |
---|---|
To: | Juan Daniel Santana Rodés <jdsantana(at)estudiantes(dot)uci(dot)cu>, Igor Neyman <ineyman(at)perceptron(dot)com> |
Cc: | "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: How to compare the results of two queries? |
Date: | 2013-09-17 18:28:45 |
Message-ID: | 1379442525.78757.YahooMailNeo@web162904.mail.bf1.yahoo.com |
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Lists: | pgsql-general |
Juan Daniel Santana Rodés <jdsantana(at)estudiantes(dot)uci(dot)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
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