From: A. Kretschmer <andreas.kretschmer@schollglas.com>
To: pgsql-sql@postgresql.org
Subject: Re: how to generate a list of distinct scalar values from a column which type is array
Date: Thu, 22 Feb 2007 13:28:01 +0100
Message-ID: <20070222122801.GD15488@a-kretschmer.de> (raw)
In-Reply-To: <2cfc7c940702211021u1ba47031l25112a69cfb18338@mail.gmail.com>
References: <2cfc7c940702211021u1ba47031l25112a69cfb18338@mail.gmail.com>
am Wed, dem 21.02.2007, um 19:21:09 +0100 mailte Sergio Andreozzi folgendes:
> Dear all,
>
> given a column which type is for instance varchar(20)[], is there any SQL
> command that let me generate the list of distinct scalar values?
>
>
> e.g.:
> col1
> row 1: (aaa, bb, c)
> row 2: (dddd, eeee)
> row 3: (aaa, eeee)
>
> the query should return:
>
> aaa
> bb
> c
> dddd
> eeee
>
> if not, I guess the approach is to use stored procedure. Any code snippet/
> suggestion?
You can, for each row, split the array into the elements with a loop
over array_lower, array_upper, returns this element. Yes, this is a
setof-function. Than you can do a simple select distinct * from
your_function.
I hope this may help you.
Andreas
--
Andreas Kretschmer
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Subject: Re: how to generate a list of distinct scalar values from a column which type is array
In-Reply-To: <20070222122801.GD15488@a-kretschmer.de>
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