From: A. Kretschmer <andreas.kretschmer@schollglas.com>
To: pgsql-sql@postgresql.org
Subject: Re: union with count?
Date: Wed, 28 Mar 2007 16:24:44 +0200
Message-ID: <20070328142444.GA20168@a-kretschmer.de> (raw)
In-Reply-To: <460A75ED.6070501@fmed.uba.ar>
References: <460A75ED.6070501@fmed.uba.ar>
am Wed, dem 28.03.2007, um 11:04:29 -0300 mailte Gerardo Herzig folgendes:
> Hi dudes, i have the following question
> i have 2 tables with the same format, and i want to know if is there a
> possibility of using some sort of count(*) for achieving this result:
> select a from table1 where (condition) union select a from table2 where
> (condition), count(a) group by a
>
> The idea is having how many times (condition) is true for both tables.
>
> Im not shure im explaining myself clearly, my english is not the best
> (as you can see ;)
You can use a subselect, a simple example:
test=# select *, count(1) from (select 1 union select 2 union select 3) foo group by 1;
?column? | count
----------+-------
1 | 1
2 | 1
3 | 1
(3 rows)
Andreas
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Andreas Kretschmer
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To: pgsql-sql@postgresql.org
Cc: andreas.kretschmer@schollglas.com
Subject: Re: union with count?
In-Reply-To: <20070328142444.GA20168@a-kretschmer.de>
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