From: Mario Guerrero <chimuelo22@yahoo.es>
To: pgsql-performance@postgresql.org
Subject: Cross Table (Pivot)
Date: Tue, 21 Jun 2011 04:35:53 +0100 (BST)
Message-ID: <688036.11174.qm@web26006.mail.ukl.yahoo.com> (raw)
Compañeros buenas noches:
Existe una sentencia SQL "fuertemente acoplada" al interios del Sistema Gestor
de
Bases de Datos Postgresql que me permita "trasponer" tablas,
algo similar al contrib cross table de tablefunc.
Estoy intentando con una sentencia como:
SELECT id, name, max(case()) as a, max(case()) as b
FROM table t1
INNER JOIN ...
INNER JOIN ...
GROUP BY id, name.
Sin embargo con un gran volumen de datos la sentencia se tarda mucho.
Agradezco de antemano sus comentarios y ayuda.
Atentamente,
Mario Guerrero
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To: pgsql-performance@postgresql.org
Cc: chimuelo22@yahoo.es
Subject: Re: Cross Table (Pivot)
In-Reply-To: <688036.11174.qm@web26006.mail.ukl.yahoo.com>
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