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Date: Thu, 13 Apr 2006 06:51:11 -0700 (PDT)
From: Richard Broersma Jr <rabroersma@yahoo.com>
Subject: Re: how to solve this problem
To: marchesini@unipg.it, pgsql-sql@postgresql.org
In-Reply-To: <1144934290.5079.32.camel@geologia5.agora.ing.unipg.it>
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Just a thought,

Could you achieve that same result using the binary representation of an integer?

Regards,

Richard

--- ivan marchesini <marchesini@unipg.it> wrote:

> Dear users,
> I have this problem 
> 
> I have a table where there are 20 columns named
> vinc1, vinc2, vinc3, vinc4, etc....
> 
> the values contained into each column are simply 1 or 0  (each column is
> dichotomic)
> 1 means presence
> 0 means absence
> 
> I would obtain a column (new_column) containg the name of the columns,
> comma separated, where the value is = 1
> 
> for example:
> 
> vinc1	vinc2	vinc3	vinc4	new_column
> 1	0	1	0	vinc1,vinc3
> 0	0	0	1	vinc4
> 0	1	1	1	vinc2,vinc3,vinc4
> 
> can someone help me to find the best way to obtain this result???
> thank you very much
> 
> Ivan
> 
> 
> 
> 
> 
> 
> 
> -- 
> Ivan Marchesini
> Department of Civil and Environmental Engineering
> University of Perugia
> Via G. Duranti 93/a 
> 06125
> Perugia (Italy)
> e-mail: marchesini@unipg.it
>         ivan.marchesini@gmail.com
> tel: +39(0)755853760
> fax: +39(0)755853756
> jabber: geoivan73@jabber.org
> 
> 
> 
> 
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