From: Michael Glaesemann <grzm@seespotcode.net>
To: Richard Broersma Jr <rabroersma@yahoo.com>
Cc: SQL Postgresql List <pgsql-sql@postgresql.org>
Subject: Re: SELECT syntax synopsis: column_definition?
Date: Tue, 21 Aug 2007 18:04:56 -0500
Message-ID: <50700110-2B0D-4935-B033-084ED908BEC5@seespotcode.net> (raw)
In-Reply-To: <830878.14424.qm@web31803.mail.mud.yahoo.com>
References: <830878.14424.qm@web31803.mail.mud.yahoo.com>
On Aug 21, 2007, at 14:34 , Richard Broersma Jr wrote:
> Can any one give an example of the difference between a
> column_alias and a column_definition when
> using a function in the FROM clause?
>
> from the manual:
> http://www.postgresql.org/docs/8.2/interactive/sql-select.html
>
> "function_name ( [ argument [, ...] ] ) [ AS ] alias
> [ ( column_alias [, ...] | column_definition
> [, ...] ) ]"
I believe it's similar to this
# select * from generate_series(1,10) as a(s);
s
----
1
2
3
4
5
6
7
8
9
10
(10 rows)
But like this:
# select * from generate_series(1,10) as a(s text);
But not quite, as this raises an error :)
ERROR: a column definition list is only allowed for functions
returning "record"
So the *form* is right, but I don't know of an example that works.
You've got me curious now, too!
Michael Glaesemann
grzm seespotcode net
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To: pgsql-sql@postgresql.org
Cc: grzm@seespotcode.net, rabroersma@yahoo.com
Subject: Re: SELECT syntax synopsis: column_definition?
In-Reply-To: <50700110-2B0D-4935-B033-084ED908BEC5@seespotcode.net>
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