Re: count (DISTINCT expression [ , ... ] ) and documentation

From: Ivan Sergio Borgonovo <mail(at)webthatworks(dot)it>
To: pgsql-general(at)postgresql(dot)org
Subject: Re: count (DISTINCT expression [ , ... ] ) and documentation
Date: 2008-12-26 18:14:00
Message-ID: 20081226191400.08551327@dawn.webthatworks.it
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On Fri, 26 Dec 2008 16:23:52 +0100
"Pavel Stehule" <pavel(dot)stehule(at)gmail(dot)com> wrote:

> 2008/12/26 Ivan Sergio Borgonovo <mail(at)webthatworks(dot)it>:
> > On Fri, 26 Dec 2008 15:46:48 +0100
> > "Pavel Stehule" <pavel(dot)stehule(at)gmail(dot)com> wrote:
> >
> >> count has only one argument,
> >
> > then what was changed between 8.1 and 8.2 to change the docs?
> > None of the functions listed in:
> > http://www.postgresql.org/docs/8.2/static/functions-aggregate.html
> > seems to support
> > aggregate(distinct exp [,exp])
>
> http://www.postgresql.org/docs/8.2/interactive/functions-aggregate.html
>
> http://www.postgresql.org/docs/8.2/interactive/functions-aggregate.html#FUNCTIONS-AGGREGATE-STATISTICS-TABLE

yeah but no function seems to support

aggregate(distinct x, y)

> CREATE AGGREGATE name ( input_data_type [ , ... ] ) (
> SFUNC = sfunc,
> STYPE = state_data_type
> [ , FINALFUNC = ffunc ]
> [ , INITCOND = initial_condition ]
> [ , SORTOP = sort_operator ]
> )

OK... but how am I going to implement an user defined aggregate that
support without resorting to C?

myaggfunc(distinct x, y)?

Otherwise to what is it referring

http://www.postgresql.org/docs/8.2/interactive/sql-expressions.html

aggregate_name (DISTINCT expression [ , ... ] )

--
Ivan Sergio Borgonovo
http://www.webthatworks.it

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