From: Jean-Luc Lachance <jllachan@nsd.ca>
To: tom@haddons.net
Cc: pgsql-sql@postgresql.org
Subject: Re: Sum of Every Column
Date: Wed, 23 Oct 2002 17:13:03 -0400
Message-ID: <3DB710DF.DE045069@nsd.ca> (raw)
References: <31182.66.47.66.34.1035404245.squirrel@tomandshirl.com>
Tom,
You can add
sum( case when <boolean_field> then 1 else 0 end)
for each field that you need.
JLL
Tom Haddon wrote:
>
> Hi Folks,
>
> 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):
>
> 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)?
>
> Thanks, Tom
>
> ---------------------------(end of broadcast)---------------------------
> TIP 1: subscribe and unsubscribe commands go to majordomo@postgresql.org
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-sql@postgresql.org
Cc: jllachan@nsd.ca, tom@haddons.net
Subject: Re: Sum of Every Column
In-Reply-To: <3DB710DF.DE045069@nsd.ca>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox