From: | George Moga <george(at)flex(dot)ro> |
---|---|
To: | SQL PostgreSQL <pgsql-sql(at)postgreSQL(dot)org> |
Subject: | Re: [SQL] joins with aggregates |
Date: | 1998-12-11 15:55:59 |
Message-ID: | 3671408F.7DC2011@flex.ro |
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Thread: | |
Lists: | pgsql-sql |
Remigiusz Soko³owski wrote:
> Hi!
> I'm wonder if it is possible to make a query which joins data from two
> tables and also aggregates some columns of one of them
> I mean something like
> SELECT p1.id_prod, p1.name_prod, d1.id_prod, sum(d1.quant_detal) FROM
> prod p1, detal d1 WHERE p1.id_prod=d1.id_prod
> GROUP BY p1.id_prod;
> TIA
> Rem
Try:
Create a new file (named ex: test.pl) with:
CREATE FUNCTION "calc_sum" ("int4") RETURNS "float8" AS '
declare
var float8;
begin
select sum(quant_detal) into var from detal where id_prod = $1;
return var;
end;
' LANGUAGE 'plpgsql';
or use the file who came with this mail.
Load the file in psql: \i test.pl and...:
SELECT p1.id_prod, p1.name_prod, d1.id_prod, calc_sum(p1.id_prod)
FROM prod p1, detal d1
WHERE p1.id_prod=d1.id_prod
GROUP BY p1.id_prod;
I create the function in PostgreSQL 6.4 on Red Hat Linux 5.1.
I don't know how this work on other versions.
I use id_prod as int4 and quant_detal as float8.
Best,
George Moga,
george(at)flex(dot)ro
george(at)cicnet(dot)ro
Braila, ROMANIA.
Attachment | Content-Type | Size |
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test.pl | application/x-perl | 197 bytes |
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