From: Josh Berkus <josh@agliodbs.com>
To: tom@haddons.net, <pgsql-sql@postgresql.org>
Subject: Re: Sum of Every Column
Date: Wed, 23 Oct 2002 14:15:31 -0700
Message-ID: <200210231415.31926.josh@agliodbs.com> (raw)
In-Reply-To: <31182.66.47.66.34.1035404245.squirrel@tomandshirl.com>
References: <31182.66.47.66.34.1035404245.squirrel@tomandshirl.com>
Tom,
> I'm hoping to put together a query that generates a report on a table with
> a large number of boolean fields. This report has to be able to adapt to
> the number of fields in the table. Essentially, I want it to provide the
> sum of TRUE values for each field for a given subset of the table. I've
> got the query that returns the subset of the table (this is based on a
> relationship with another table):
Sounds like you have schema problems. Is this a legacy database, or did you
design it yourself?
>
> SELECT breast_cancer_resources.*
> FROM breast_cancer_resources, agency_contact_info
> WHERE breast_cancer_resources.id=agency_contact_info.id
> AND agency_contact_info.guideregion=1
> AND agency_contact_info.list_online=TRUE
>
> But I'm not sure how to generate the sum for each column. Should I be
> looking elsewhere than SQL to do this for me, such as php (this is for a
> web-based report)?
You cannot dynamically sum all columns through SQL. You would need to use a
procedural language to loop through the columns and create sum clauses for
each one.
--
-Josh Berkus
Aglio Database Solutions
San Francisco
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To: pgsql-sql@postgresql.org
Cc: josh@agliodbs.com
Subject: Re: Sum of Every Column
In-Reply-To: <200210231415.31926.josh@agliodbs.com>
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