From: junaidmalik14 <junaidmalik14@gmail.com>
To: pgsql-sql@postgresql.org
Subject: Re: count function alternative in postgres
Date: Fri, 23 Apr 2010 03:45:08 -0700 (PDT)
Message-ID: <28339793.post@talk.nabble.com> (raw)
In-Reply-To: <20100406184714.GA3290@osiris.mauzo.dyndns.org>
References: <28126792.post@talk.nabble.com>
<20100406184714.GA3290@osiris.mauzo.dyndns.org>
Thanks Ben. It works fine.
Junaid.
Ben Morrow-2 wrote:
>
> Quoth junaidmalik14@gmail.com (junaidmalik14):
>>
>> Is there any alternative of mysql function COUNT(DISTINCT expr,[expr...])
>> in
>> postgres. We get error if we
>>
>> write count like this count(distinct profile.id, profile.name,
>> profile.age)
>> but it works well in mysql.
>
> Pg does support COUNT(DISTINCT ), but only for a single column. The best
> I can come up with for multiple columns is
>
> select count(distinct profile.tuple) from
> (select (id, name, age) as tuple from profile)
> as profile;
>
> or alternatively
>
> select count(*) from
> (select distinct (id, name, age) as tuple from profile)
> as profile;
>
> Ben
>
>
> --
> Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org)
> To make changes to your subscription:
> http://www.postgresql.org/mailpref/pgsql-sql
>
>
--
View this message in context: http://old.nabble.com/count-function-alternative-in-postgres-tp28126792p28339793.html
Sent from the PostgreSQL - sql mailing list archive at Nabble.com.
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: junaidmalik14@gmail.com
Subject: Re: count function alternative in postgres
In-Reply-To: <28339793.post@talk.nabble.com>
* 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