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 14:34:33 +0100
Message-ID: <20070222133433.GF15488@a-kretschmer.de> (raw)
In-Reply-To: <20070222132536.GE15488@a-kretschmer.de>
References: <2cfc7c940702211021u1ba47031l25112a69cfb18338@mail.gmail.com>
<20070222132536.GE15488@a-kretschmer.de>
am Thu, dem 22.02.2007, um 14:25:36 +0100 mailte A. Kretschmer folgendes:
> test=*# select * from a;
> c
> -------------
> {aaa,bb,c}
> {dddd,eeee}
> {aaa,eeee}
> (3 rows)
>
>
> test=*# select distinct c[s] from a, generate_series(1,3)s where c[s] is not null;
> c
> ------
> aaa
> bb
> c
> dddd
> eeee
> (5 rows)
>
>
> You need to know the greatest upper dimension of the array, in this case
> 3, for the generate_series - function.
select distinct c[s] from a, generate_series(1,(select max(array_upper(c,1)) from a))s where c[s] is not null;
;-)
Andreas
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Andreas Kretschmer
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To: pgsql-sql@postgresql.org
Cc: andreas.kretschmer@schollglas.com
Subject: Re: how to generate a list of distinct scalar values from a column which type is array
In-Reply-To: <20070222133433.GF15488@a-kretschmer.de>
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